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Schistosomiasis, a disease caused by a parasitic worm, is prevalent in

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Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.


A. the freshwater snails that are the parasite's hosts for part of its life cycle

B. the freshwater snails that are the parasite's hosts in part of their life cycle

C. freshwater snails which become the parasite's hosts for part of its life cycles

D. freshwater snails which become the hosts of the parasite during the parasite's life cycles

E. parasite's hosts, freshwater snails which become their hosts during their life cycles

Verbal Question of The Day: Day 268: Sentence Correction


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Question # 92 from the Verbal Review - 2nd Edition of the Official Guide - Sentence Correction (page 310)


https://www.nytimes.com/1985/07/27/us/drop-in-drug-cost-may-allow-all-out-attack-on-a-parasite.html

Like other drugs used to treat schistosomiasis, praziquantel does not kill all the parasites in a person's body but reduces their number until the symptoms disappear. Unlike malaria parasites, those for schistosomiasis cannot multiply in the body. Once their population is reduced it remains low unless the victim is infected again.

Freshwater snails are the parasite's hosts for part of its life cycle, just as mosquitoes are hosts for malaria. The disease is prevalent in hot, humid climates and has become more widespread as irrigation projects have enlarged the habitat of the snails.

Originally posted by getzonator on 25 Jan 2012, 06:17.
Last edited by Bunuel on 08 Jul 2019, 21:32, edited 3 times in total.
Renamed the topic and edited the question.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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MGMAT( in a reversal from its earlier rigid stand perhaps) says that the issue of possessive poison is not worth worrying about since there has been hardly any case that has been rejected on the score of the possessive pronoun’s antecedence in the realm of GMAT.

The takeaway of possessive pronoun custom is;

1. A possessive pronoun can stand for a possessive noun
2. A possessive pronoun can stand for a non- possessive noun
3. A non-possessive pronoun can stand for a non- possessive noun.
4. The only case where it can‘t be accepted is when a non-possessive is used to stand for a possessive noun


A. the freshwater snails that are the parasite's hosts for part of its lifecycle --- here its is possessive and parasite’s is possessive. So there is no issue. correct choice
B. the freshwater snails that are the parasite's hosts in part of their life cycle – pronoun number agreement
C. freshwater snails which becomes the parasite's hosts for part of its life cycles—snails which becomes – S-V mismatch
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles--- how many life cycles does the parasite have? Secondly, do all the hosts have one parasite? Illogical
E. parasite's hosts, freshwater snails which become their hosts during their life cycles— parasite is singular while the 'their' is a plural pronoun.
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Originally posted by daagh on 04 Aug 2012, 22:14.
Last edited by daagh on 12 May 2017, 22:18, edited 1 time in total.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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Quote:
A. the freshwater snails that are the parasite's hosts for part of its life cycle

I don’t have a whole lot to say about (A). The first thing I notice is the modifier “that are the parasite’s hosts” – and that seems like a reasonable way to modify “the freshwater snails.”

The pronoun “its” also jumps out at me, and that would have to refer to “the parasite’s”, since that’s our nearest (and most logical) singular. And that’s fine, too: “…the freshwater snails that are the parasite’s hosts for part of [the parasite’s] life cycle…” Reasonable enough.

So I guess we’ll keep (A).

Quote:
B. the freshwater snails that are the parasite's hosts in part of their life cycle

The biggest difference between (B) and (A) is the plural pronoun “their” in (B). And that’s a problem: “their” is plural, so it has to refer to either “the freshwater snails” or “the parasite’s hosts” – and those are the same thing, anyway. So that gives us: “… the freshwater snails that are the parasite’s hosts in part of [the freshwater snails’] life cycle.”

That’s not WRONG, exactly, if you’re willing to assume that the sentence is trying to explain what happens during the snails’ life cycle. But I think that misses the point: schistosomiasis is the grammatical subject of the sentence, and the sentence is clearly trying to explain why the disease has become more common. So presumably, the sentence is interested in explaining that the snails are hosts during part of the parasite’s life cycle. The snail’s life cycle really isn’t of interest to us, and wouldn’t help explain why the parasite has become more common.

So that’s miserably subtle, but it’s basically all we’ve got, unless you want to make an unnecessarily big deal out of the prepositions. (A) is better than (B), so we can eliminate (B).

Quote:
C. freshwater snails which becomes the parasite's hosts for part of its life cycles

(C) is a little bit easier to eliminate than some of the other options. The phrase “its life cycles” really doesn’t make any sense at all: “its” presumably refers to “the parasite”, since that’s the closest (and most logical) singular noun. But then how is that “the parasite” has multiple “life cycles”? As far as I know, each parasite only has one life cycle. If not, that would be creepy AF.

There’s also a problem with the phrase “freshwater snails which becomes.” Snails are plural, so the verb would have to be “become”, not “becomes.” Plus, “which” is generally a non-restrictive modifier, so it usually follows a comma – though that’s not usually a deciding factor on GMAT questions.

So we have lots of reasons to ditch (C).

Quote:
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles

(D) is a little bit better than (C)… but only a little bit.

I guess it’s nice that “its life cycles” has been changed to “the parasite’s life cycles”, but either way, it’s illogical: a singular parasite presumably has only one life cycle, not multiple “life cycles.”

It’s also nice that the subject-verb issue has been fixed (“snails… become”), but I still don’t think it’s ideal to use “which” in this type of scenario without a comma. But again: the GMAT doesn’t generally make a big deal out of comma placement, and it’s almost never a deciding factor.

And even if you ignore the comma thing, the phrase “parasite’s life cycles” is goofy enough to let us eliminate (D).

Quote:
E. parasite's hosts, freshwater snails which become their hosts during their life cycles

The plural pronoun “their” appears twice in (E), but “parasite’s” is actually singular, so “their” presumably refers to “snails.” And that’s garbage: “… freshwater snails which become [the snails’] hosts during [the snails’] life cycles…”

You could also argue that “which” needs to be preceded by a comma, as we mentioned in (C) and (D) – but again, that’s rarely a deciding factor on the GMAT.

The pronoun thing is a big deal, though. (E) is out, and we’re left with (A).
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 01 Sep 2013, 21:14
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A. the freshwater snails that are the parasite's hosts for part of its life cycle
Should keep it
B. the freshwater snails that are the parasite's hosts in part of their life cycle
For part of its life cycle seems ok
but in part of their life cylce seems not as "parasite" is singular and their is plural.

C. freshwater snails which becomes the parasite's hosts for part of its life cycles
Which should be preceded by comma.
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
Same as (C).
E. parasite's hosts, freshwater snails which become their hosts during their life cycles
Changes the meaning and this one says that habitat of parasite's hosts and not of freshwater snails has been enlarged
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 03 Apr 2012, 04:24
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First of all "ITS " is a possessive pronoun that can correctly refer to possessive.

A. the freshwater snails that are the parasite's hosts for part of its life cycle
--> everything is CORRECT; ITS correctly refers to the possessive.

B. the freshwater snails that are the parasite's hosts in part of their life cycle
--> THEIR is wrong as per subject -verb agreement.

C. freshwater snails which becomes the parasite's hosts for part of its life cycles
--. SV error

D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
-->
1) which is incorrectly used--> which introduces non essential part and also is used a comma.
2) unnecessarily wordy;
3) indicates "a parasite has several life cycles"

E. parasite's hosts, freshwater snails which become their hosts during their life cycles
--> pronoun error

Hope this helps...!!
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 03 Apr 2012, 06:46
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First, the possessive pronoun ‘its’ is properly referring to the singular parasite and its apostrophe (parasite’s) and not the plural parasites and its apostrophe (parasites’) as has been stated.
It may be noted that the first pronoun ‘it’ refers to the disease, while the second pronoun ‘its’ refers to the parasite’s due to proximity. In the case of possessive pronouns, the antecedence rules are relaxable, if logic demands.

A is good enough,IMO, as the other choices are not really challenging enough in terms of grammar, as has been stated by the poster
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 28 Feb 2013, 08:57
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ratinarace wrote:
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF ITS LIFE CYCLE.

A. the freshwater snails that are the parasite's hosts for part of its life cycle
B. the freshwater snails that are the parasite's hosts in part of their life cycle
C. freshwater snails which becomes the parasite's hosts for part of its life cycles
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
E. parasite's hosts, freshwater snails which become their hosts during their life cycles


Can somebody please explain why cant their refer back to the SNAILS...I mean it still would make perfect sense "snail serve as host for a part in their life cycle"

I understand from the explanations that this is not the intended meaning, but how can gmat expect the test taker to peep in the author's brain?


Hi ratinarace, when dealing with pronoun questions, it's always simplest to replace the pronoun by the word it is replacing and verify that the pronoun agrees with the noun.

In this case, the sentence should be:
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF the worm's LIFE CYCLE. Who's life cycle are we referring to? The parasite, which in turn is referencing the worm.

If you want it to reference the snails (plural), also note that the sentence is slightly different (in part vs for part). In part usually means "as one of the reasons of" whereas for part usually means "for an incomplete period". I chose this answer in part because the idiom was good for this part of the test.

Between the intention and the phrasing, I agree that A should be the correct answer, but B is a tempting choice as well.

Hope this helps!
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 28 Feb 2013, 09:43
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ratinarace wrote:
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF ITS LIFE CYCLE.

A. the freshwater snails that are the parasite's hosts for part of its life cycle
B. the freshwater snails that are the parasite's hosts in part of their life cycle
C. freshwater snails which becomes the parasite's hosts for part of its life cycles
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
E. parasite's hosts, freshwater snails which become their hosts during their life cycles


Can somebody please explain why cant their refer back to the SNAILS...I mean it still would make perfect sense "snail serve as host for a part in their life cycle"

I understand from the explanations that this is not the intended meaning, but how can gmat expect the test taker to peep in the author's brain?


Hi ratinarace,

"their" can refer to snails and in (B) "their" is in fact referring to "snails", but it shouldn't. The sentence is discussing about the life cycle of the parasite and not the snails. In (B) "their" refers to snails, resulting in change in the meaning of the original sentence.

Well, it may appear that GMAT expects one to peep into the author's brain. :-) But while answering you should keep in mind that the answer choice that changes the meaning of the original sentence is almost always incorrect. If we have two grammatically correct answer choices then the one which preserves the meaning of the original sentence is most likely to be the correct one.

Hope this helps,

Vercules
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 28 Feb 2013, 20:18
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To understand this issue correctly, one requires to look at the science of logic and I wonder whether it could have been the intention of the framers of this topic. If you understand the relationship between a host and a parasite, it is like this.

There are millions of hosts of a species and millions of parasites of the same. But it is not essential that the host has to necessarily have a parasite as part of its life cycle. It can continue to live healthily without getting infected by the parasite. For example do we all get malaria? No. we don’t. So a mosquito is not part of our life-cycle.
But not so in the case of the parasite. A parasite has to depend upon its host for some time, if it has to successfully complete its life cycle. Looking therefore from the meaning point, - its - should refer to the parasite in this case. So A.

I am not clear whether this fine tuning is by default or by design by the originators.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 22 Sep 2014, 08:56
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Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF ITS LIFE CYCLE.

A. the freshwater snails that are the parasite's hosts for part of its life cycle - Correct Answer , Its correctly refer to parasite's (both are relative pronouns)
B. the freshwater snails that are the parasite's hosts in part of their life cycle - part of parasite's lifecycle, not snail's lifecycle - distorts meaning
C. freshwater snails which becomes the parasite's hosts for part of its life cycles - parasite can have one life cycle.
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles - parasite can have one life cycle.
E. parasite's hosts, freshwater snails which become their hosts during their life cycles - Same error as in B


This one is hard... :roll:
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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ramarao443 Normally we don't switch antecedents for a pronoun. In other words, once we've said that "it=disease," we don't assign "it" or "its" to any other noun. With this in mind, A would seem problematic. However, there are a few complications:

*First, there has been no possessive noun except for "parasite's." We aren't supposed to use a possessive pronoun unless there's an actual possessive noun to refer back to, so this points toward "parasite's" as the antecedent for "its."

*Second, the proximity of the pronoun and its antecedent makes it especially awkward to use the noun again. It would be like saying "My wife and I went to Kay's house for Kay's birthday party." Sure, there are two women in the sentence, but proximity (in conjunction with the possessive and the overall meaning) makes it very clear who's party we're talking about.

*Finally, D has several other grammatical problems. ("Wordy" is usually not an objection we want to accept.) We don't want to say that one parasite has multiple life cycles. We also need to begin the underlined portion with "the" to make it clear that we are talking about a specific group of freshwater snails. With that in mind, we also want to use "that" rather than "which." We use "that" to indicate essential modifiers. These are modifiers that become part of the noun phrase. Non-essential modifiers just add parenthetical information about the noun in general.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 28 Oct 2016, 22:51
VeritasPrepRon wrote:
ratinarace wrote:
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF ITS LIFE CYCLE.

A. the freshwater snails that are the parasite's hosts for part of its life cycle
B. the freshwater snails that are the parasite's hosts in part of their life cycle
C. freshwater snails which becomes the parasite's hosts for part of its life cycles
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
E. parasite's hosts, freshwater snails which become their hosts during their life cycles


Can somebody please explain why cant their refer back to the SNAILS...I mean it still would make perfect sense "snail serve as host for a part in their life cycle"

I understand from the explanations that this is not the intended meaning, but how can gmat expect the test taker to peep in the author's brain?


Hi ratinarace, when dealing with pronoun questions, it's always simplest to replace the pronoun by the word it is replacing and verify that the pronoun agrees with the noun.

In this case, the sentence should be:
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF the worm's LIFE CYCLE. Who's life cycle are we referring to? The parasite, which in turn is referencing the worm.

If you want it to reference the snails (plural), also note that the sentence is slightly different (in part vs for part). In part usually means "as one of the reasons of" whereas for part usually means "for an incomplete period". I chose this answer in part because the idiom was good for this part of the test.

Between the intention and the phrasing, I agree that A should be the correct answer, but B is a tempting choice as well.

Hope this helps!
-Ron



hi experts, please help me to clarify this problem.
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of THE FRESHWATER SNAILS THAT ARE THE PARASITE'S HOSTS FOR PART OF ITS LIFE CYCLE.

in the original question, first it clearly refers to a disease (Schistosomiasis)
the second its refers to parasitic worm.
as i have learnt, it should not be the case.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 30 Oct 2016, 15:08
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Thanks! It's interesting to note that while they describe the rule limiting "which" to nonrestrictive clauses as "controversial," the question itself still follows the rule. It's also useful to keep in mind that the explanation writer is not the same as the question writer! One of my colleagues describes the explanation writers as the "B Team." :)

However, this indication of flexibility does underscore a point I often make: that it's much more important to get good at reading for solid sentence structure (e.g. subject-verb and parallelism) and overall meaning than it is to memorize long lists of idioms or to spend hours agonizing over the use of "because of" vs. "due to." We don't need to be masters of which vs. that to ace this test!

I should add that this rule is indeed controversial. My brother, for instance, refuses to acknowledge it as a rule at all, saying that it was made up by a few fussy 20th-century copy-editors who have no more claim than the rest of us to dictate how the English language should be used. He may well have a point!
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It's also useful to keep in mind that the explanation writer is not the same as the question writer! One of my colleagues describes the explanation writers as the "B Team." :)


Sooooo true! My hunch is that whoever writes the explanations is an intern of some sort, and not necessarily a professional question-writer at all. Plus, a lot of the questions that leak into the official guides are 10 or 15 or 20 years old -- and whoever wrote them originally is probably long gone.

Fun fact: at ETS (the company that writes the TOEFL and GRE, among other tests), the question-writers are literally in a different building from the psychometricians who design the exam. No idea if the same is true at GMAC, but it wouldn't surprise me.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

Issues: Diction | Modifier | Verb Tense

Analysis:
1. The sentence talks about a disease caused by a parasitic worm that has become widespread due to enlarging habitat of the freshwater snails.
2. The options have couple of things wrong in them that I have highlighted below.


A. the freshwater snails that are the parasite's hosts for part of its life cycle

B. the freshwater snails that are the parasite's hosts in part of their life cycle
- "in part" does not convey the intended meaning
- "their" (plural) either incorrectly refers to "parasite" (singular) or non-sensically refers "freshwater snails"


C. freshwater snails which becomes the parasite's hosts for part of its life cycles
- "becomes" does not agree with "freshwater snails" in number
- "life cycles" is incorrect as a worm will only have a single life cycle.


D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
- "becomes the hosts" is wordy and unnecessary
- "during the parasite's life cycles" changes the meaning as the snail is host for only a part of the life-cycle.
- Also, "life cycles" is incorrect as a worm will only have a single life cycle.


E. parasite's hosts, freshwater snails which become their hosts during their life cycles
- "their" in two places does not agree with singular "parasite"
- "during their life cycles" changes the meaning as the snail is host for only a part of the life-cycle.


Answer: A.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 15 May 2017, 18:06
getzonator wrote:
Question # 92 from the Verbal Review - 2nd Edition of the Official Guide - Sentence Correction (page 310)

Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

A. the freshwater snails that are the parasite's hosts for part of its life cycle
B. the freshwater snails that are the parasite's hosts in part of their life cycle
C. freshwater snails which becomes the parasite's hosts for part of its life cycles
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
E. parasite's hosts, freshwater snails which become their hosts during their life cycles


GMATNinjaTwo "that are the parasite's hosts for part of its life cycle" modifier describing snails

it = schistosomiasis = the parasite

Is it "its" referring to "parasite's" or schistosomiasis?
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in  [#permalink]

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New post 16 May 2017, 04:00
ziyuen wrote:
getzonator wrote:
Question # 92 from the Verbal Review - 2nd Edition of the Official Guide - Sentence Correction (page 310)

Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

A. the freshwater snails that are the parasite's hosts for part of its life cycle
B. the freshwater snails that are the parasite's hosts in part of their life cycle
C. freshwater snails which becomes the parasite's hosts for part of its life cycles
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles
E. parasite's hosts, freshwater snails which become their hosts during their life cycles


GMATNinjaTwo "that are the parasite's hosts for part of its life cycle" modifier describing snails

it = schistosomiasis = the parasite

Is it "its" referring to "parasite's" or schistosomiasis?


it in it has become more widespread refers to Schistosomiasis.

its in that are the parasite's hosts for part of its life cycle refers to parasite's. So, effectively, this portion says -- ...the the freshwater snails that are the parasite's host for part of the parasite's life cycle.

Cheers! :)
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New post 20 May 2017, 10:26
neetis5 wrote:
it in it has become more widespread refers to Schistosomiasis.

its in that are the parasite's hosts for part of its life cycle refers to parasite's. So, effectively, this portion says -- ...the the freshwater snails that are the parasite's host for part of the parasite's life cycle.

Cheers! :)


Thanks neetis5! Yes, "its" is a possessive pronoun referring to the possessive "parasite's".
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New post 20 Apr 2018, 07:42
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IMO A

A. the freshwater snails that are the parasite's hosts for part of its lifecycle --- Although we have a pronoun in place of possessive noun but it is best among the lot its refer to singular parasite's correct choice
B. the freshwater snails that are the parasite's hosts in part of their life cycle – pronoun number agreement their refers to singular parasite's
C. freshwater snails which becomes the parasite's hosts for part of its life cycles—snails which becomes – S-V mismatch
D. freshwater snails which become the hosts of the parasite during the parasite's life cycles--- wrongly stated life cycles should be cycle.
E. parasite's hosts, freshwater snails which become their hosts during their life cycles— parasite is singular while the 'their' is a plural pronoun.
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New post 20 Apr 2018, 12:23
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souvik101990 wrote:

Verbal Question of The Day: Day 268: Sentence Correction


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Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.

A. the freshwater snails that are the parasite's hosts for part of its life cycle

B. the freshwater snails that are the parasite's hosts in part of their life cycle

C. freshwater snails which becomes the parasite's hosts for part of its life cycles

D. freshwater snails which become the hosts of the parasite during the parasite's life cycles

E. parasite's hosts, freshwater snails which become their hosts during their life cycles



"Life cycles" does not make any sense as there is only one life cycle unless you are captain America:P so C, D, E are out. Its the parasite's life cycle not the snail's. Hence only A is left.
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Re: Schistosomiasis, a disease caused by a parasitic worm, is prevalent in   [#permalink] 20 Apr 2018, 12:23

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