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Doctors still know little about how the Listeria bacterium is spread and why the disease( it causes, listeriosis, )afflicts some people (in a contaminated area) while sparing many others

The answer lies in //ism. Read the above while ignoring the brackets.
...disease afflicts some people while sparing many others is //

At first glance even I fell for A but a closer look helped identify the mistake.
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Answer E.
I can tell why when and where are wrong
and why is option A here is wrong due to the usage of "it"
Despite --- in spite of
I dont know why despite is wrong but I preferred While over despite.
usage of While
It can actually mean two things:
1) while = at the same time as.
2) while = although, or some sort of contrast.
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Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some people in a contaminated area though it spares many others.

Actually I would reject B and pick E for a different reason.

The pronoun ‘it’ appears at two junctures; in the first place, the pronoun refers to the bacterium while in the second place, it refers to the disease. In GMAT terms, it is wrong for a pronoun to refer to two different entities in a same sentence. In E, this problem has been circumvented by converting the later portion into a modifying phrase, dropping the pronoun altogether.
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Hey, dude, can u pls underline the quest.

in A & B it has no clear referance. A&B out
Despite, When seem irrelevant here
E is my ans

OA is E. The point is that we need a description that can either contrast the two situations (different groups of people), or demonstrate their happening simultaneously.

(A) though it spares
Wrong for two reasons.
(1) In GMAT, we can say for sure that it is incorrect to use one SAME PRONOUN more than twice.
(2) You often use "though" to introduce a fact that you regard as less important than the fact in the main clause.

(B) where it spares
Wrong for "it". In GMAT, we can say for sure that it is incorrect to use one SAME PRONOUN more than twice.
Note: "where" is correctly used here.
You use "where" to introduce a clause that contrasts with the other part of the sentence.regard as less important than the fact in the main clause.

(C) despite sparing
Wrong for "despite"
You use "despite" to introduce a fact that makes the other part of the sentence surprising.

(D) when sparing
Wrong for "When"
You use "when" to introduce a fact that makes the other part of the sentence surprising or impossible.

(E) while sparing
Correct.
You use "while"
(1) before making a statement, to introduce a fact that partly conflicts the following statement.
(2) to introduce a fact that happens simultaneously with the following statement.
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Answer choice "A" is not preferred because "it" is ambiguous. “Despite” and “while” have different meanings. Replace “despite” with “instead of” and read the sentence. It does not make sense- the disease is not preferring any particular victim! So, “while” fits in better.
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In A and B, it is not that the pronoun ‘it’ has no proper referents. The problem is that ‘it’ refers to two different things. The first ‘it’ refers to the bacterium and the second ‘it’ refers to the disease. Ambiguity is not an issue but the multiple references are.

Despite is inappropriate in this context because despite always involves a paradox. Say like: Despite my low GMAT score, I got admitted into the Ivy League; Churchill was sure of his victory despite the series of defeats until the very end. etc, etc.

So E wins
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Dear Friends,

Here is a detailed explanation to this question-

rgarg1nortel
Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some people in a contaminated area though it spares many others.

(A) though it spares
(B) where it spares
(C) despite sparing
(D) when sparing
(E) while sparing

Choice A: Although the conjunction "though" does show contrast, it does not convey the exact intended meaning that the disease infects some people in an infected area and at the same time spares others. Moreover, in Option A, the pronoun "it" is used to refer to two different nouns, “Listeria bacterium” and “listeriosis”. Thus, Option A is incorrect.

Choice B: The use of the word "where" fails to bring out the intended contrast, as it refers to a specific place, altering the intended meaning of the sentence. Moreover, Option B shares the pronoun ambiguity, regarding "it", that Option A displays.

Choice C: The use of the word "despite" fails to bring out the intended contrast. Thus, Option C is not a good answer choice.

Choice D: The use of the word "when" fails to bring out the intended contrast, as it refers to a specific point in time, altering the intended meaning of the sentence. Thus, Option D is not a good answer choice.

Choice E: Answer E uses the conjunction "while"; this conjunction conveys a sense of concurrence. In doing so, this answer choice successfully conveys the intended meaning of the sentence. Thus, Option E is correct.

Hence, E is the best answer choice.

All the best!
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On this one, I disqualify E because "sparing" isn't parallel to afflicts.
can you please explain why the use of "ing" in this case is still ok?

Thanks!
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