GMAT Critical Reasoning

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Source: OG

Level: 4

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

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