Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 24 May 2017, 21:02

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Some batches of polio vaccine used around 1960 were

Author Message
TAGS:

### Hide Tags

Senior Manager
Status: Making every effort to create original content for you!!
Joined: 23 Dec 2010
Posts: 484
Location: United States
Concentration: Healthcare, Social Entrepreneurship
GMAT 1: 660 Q48 V34
GMAT 2: 750 Q49 V42
Followers: 361

Kudos [?]: 2024 [2] , given: 82

Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

28 Mar 2013, 04:18
2
KUDOS
Expert's post
1
This post was
BOOKMARKED
00:00

Difficulty:

5% (low)

Question Stats:

82% (01:59) correct 18% (01:09) wrong based on 278 sessions

### HideShow timer Statistics

Some batches of polio vaccine used around 1960 were contaminated with SV40, a virus that in monkeys causes various cancers. Some researchers now claim that this contamination caused some cases of a certain cancer in humans, mesothelioma. This claim is not undercut by the fact that a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer, since___________.

A) most cases of mesothelioma are caused by exposure to asbestos
B) in some countries, there was no contamination of the vaccine
C) SV40 is widely used in laboratories to produce cancers in animals
D) mesotheliomas take several decades to develop
E) mesothelioma was somewhat less common in 1960 than it is now
[Reveal] Spoiler: OA

_________________

If you have any questions
New!
Manager
Joined: 13 Aug 2012
Posts: 114
Followers: 1

Kudos [?]: 70 [0], given: 118

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

29 Mar 2013, 00:49
Why can't A be the answer?
Manager
Joined: 31 May 2010
Posts: 96
Followers: 1

Kudos [?]: 35 [1] , given: 25

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

29 Mar 2013, 00:59
1
KUDOS
'D' for me.

Researchers are now at present making claim of the effect of something that happened in past .... so effect of contamination happened 1960 took time......

Survey was made in 1960,so this survey does not undercut the argument ("some researchers now claim that this contamination caused some cases of a certain cancer in humans, mesothelioma") because mesotheliomas take several decades to develop
_________________

Kudos if any of my post helps you !!!

VP
Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 1083
Location: India
GMAT 1: 410 Q35 V11
GMAT 2: 530 Q44 V20
GMAT 3: 630 Q45 V31
GPA: 3.84
WE: Engineering (Transportation)
Followers: 38

Kudos [?]: 565 [0], given: 70

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

30 Mar 2013, 01:39
I was locked between C and D.
But eliminated C , as it presents the repackaged premise...Moreover we need to link that "why fewer people were found with the disease, but researcher claimed that there are people who suffer from cancer coz of the chemical"
D bridges the gap

Archit
GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10368
Followers: 997

Kudos [?]: 225 [0], given: 0

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

10 Apr 2017, 01:18
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Manager
Joined: 17 Aug 2012
Posts: 135
Location: India
Concentration: General Management, Strategy
Schools: Copenhagen, ESMT
GPA: 3.75
WE: Consulting (Energy and Utilities)
Followers: 0

Kudos [?]: 11 [0], given: 134

Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

28 Apr 2017, 01:30
Some researchers now claim that this contamination caused some cases of a certain cancer in humans, mesothelioma but in carfule survey done in 1960 there were no sign of cancer .
Probably it will take decade to develop

Manager
Joined: 04 Sep 2016
Posts: 53
Followers: 0

Kudos [?]: 4 [0], given: 42

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

12 May 2017, 07:39
Hi Experts,
Can you help me to distinguish if this is an assumption question or strengthen question? Furthermore, what does phrase - is not undercut - suggest?
I am presenting my analysis:
Some batches of polio vaccine used around 1960 were contaminated with SV40, a
virus that in monkeys causes various cancers.

This is a fact.

Some researchers now claim that
this contamination caused some cases of a certain cancer in humans,
mesothelioma.

This sentence is claim by researchers so it can be a belief of people other than author hence it is not main conclusion.

This claim is not undercut by the fact that a very careful survey
elevated incidence of any cancer, since ..

I took this whole sentence as fact and then I realized that only - This claim is not undercut by the fact - is the main conclusion. How can I avoid such traps? Further reading the argument also confused me since am i suppose to prove the fact that people in 1960 did not develop cancer in spite of getting contaminated vaccines. Since I wasn't able to understand argument in first place, I could not figure out correct OA.
GMAT Club Verbal Expert
Status: GMAT and GRE tutor
Joined: 13 Aug 2009
Posts: 483
Location: United States
GMAT 1: 780 Q51 V46
GMAT 2: 800 Q51 V51
GRE 1: 340 Q170 V170
Followers: 143

Kudos [?]: 351 [0], given: 185

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

13 May 2017, 14:38
Expert's post
Top Contributor
Quote:
Hi Experts,
Can you help me to distinguish if this is an assumption question or strengthen question? Furthermore, what does phrase - is not undercut - suggest?
I am presenting my analysis:
Some batches of polio vaccine used around 1960 were contaminated with SV40, a
virus that in monkeys causes various cancers.

This is a fact.

Some researchers now claim that
this contamination caused some cases of a certain cancer in humans,
mesothelioma.

This sentence is claim by researchers so it can be a belief of people other than author hence it is not main conclusion.

This claim is not undercut by the fact that a very careful survey
elevated incidence of any cancer, since ..

I took this whole sentence as fact and then I realized that only - This claim is not undercut by the fact - is the main conclusion. How can I avoid such traps? Further reading the argument also confused me since am i suppose to prove the fact that people in 1960 did not develop cancer in spite of getting contaminated vaccines. Since I wasn't able to understand argument in first place, I could not figure out correct OA.

The claim of the researchers is that contamination of the polio vaccine used around 1960 caused some cases of mesothelioma in humans. "The fact that a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer" could potentially weaken (ie "undercut") this claim. Why? Because this evidence seems to show that the contaminated vaccine did NOT cause the cases of mesothelioma, as stated in the researchers' claim.

Identifying the conclusion is, indeed, a crucial step in tackling questions like this: "{the researchers'} claim is not undercut by the fact that a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer." Since that is the conclusion, the correct choice must answer the following question: why doesn't the survey evidence weaken the researchers' claim, even though the survey evidence seems to weaken the researchers' claim? If "mesotheliomas take several decades to develop", then patients surveyed soon after receiving the contaminated vaccine would not yet show signs of having the cancer, even if they do in fact have the cancer. In that case, the survey evidence does not undermine the researchers' claim, so (D) is correct.
_________________

www.gmatninja.com + blog

Join us for the verbal experts' live chat every Wednesday, 8 am PST/8:30 pm IST! Details available here.

Rules for posting in verbal forum | How to use search function (before posting questions!)

GMAT Club's ultimate verbal study plan, 2017 edition

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7372
Location: Pune, India
Followers: 2287

Kudos [?]: 15102 [0], given: 224

Re: Some batches of polio vaccine used around 1960 were [#permalink]

### Show Tags

23 May 2017, 03:23
Hi Experts,
Can you help me to distinguish if this is an assumption question or strengthen question? Furthermore, what does phrase - is not undercut - suggest?
I am presenting my analysis:
Some batches of polio vaccine used around 1960 were contaminated with SV40, a
virus that in monkeys causes various cancers.

This is a fact.

Some researchers now claim that
this contamination caused some cases of a certain cancer in humans,
mesothelioma.

This sentence is claim by researchers so it can be a belief of people other than author hence it is not main conclusion.

This claim is not undercut by the fact that a very careful survey
elevated incidence of any cancer, since ..

I took this whole sentence as fact and then I realized that only - This claim is not undercut by the fact - is the main conclusion. How can I avoid such traps? Further reading the argument also confused me since am i suppose to prove the fact that people in 1960 did not develop cancer in spite of getting contaminated vaccines. Since I wasn't able to understand argument in first place, I could not figure out correct OA.

Responding to a pm:

"not undercut" means "not weakened".

Premises:
Some polio vaccines in 1960s were contaminated by SV40.
Researchers claim that SV40 can cause mesothelioma.

Question stem: This claim is not undercut by the fact that a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer, since___________.

Normally, if one would say "a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer", this would weaken the claim of the researchers. The researchers say that SV40 could cause mesothelioma but since no elevated incidence was found, we would doubt the claim of the researchers.
But we need to find the reason this claim is not put in doubt by "no elevated incidence found".

Look at option (D): mesotheliomas take several decades to develop

The contaminated vaccine is given in 1960s. The survey was conducted in 1960s itself. If mesothelioma takes several decades to develop, we will not see an elevated incidence in the 60s decade itself. We will see an elevated incidence in later decades. Hence this option nicely completes the sentence.

All other options are irrelevant.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for \$199

Veritas Prep Reviews

Re: Some batches of polio vaccine used around 1960 were   [#permalink] 23 May 2017, 03:23
Similar topics Replies Last post
Similar
Topics:
5 Some scientists, who today are recognized for their brilliance, were 5 23 May 2017, 08:32
3 Vaccination efficacy 3 21 Sep 2016, 12:21
4 If the airspace around centrally located airport were 5 12 May 2017, 10:35
7 If the airspace around centrally located airports were 12 18 Jan 2017, 18:00
26 Business Consultant: Some corporations shun the use of 44 24 Nov 2016, 04:44
Display posts from previous: Sort by