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Some batches of polio vaccine used around 1960 were

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Some batches of polio vaccine used around 1960 were [#permalink] New post 28 Mar 2013, 03:18
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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

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Re: Some batches of polio vaccine used around 1960 were [#permalink] New post 28 Mar 2013, 23:49
Why can't A be the answer?
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Re: Some batches of polio vaccine used around 1960 were [#permalink] New post 28 Mar 2013, 23:59
'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
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Re: Some batches of polio vaccine used around 1960 were [#permalink] New post 30 Mar 2013, 00:39
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

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Re: Some batches of polio vaccine used around 1960 were   [#permalink] 30 Mar 2013, 00:39
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Some batches of polio vaccine used around 1960 were

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