GMAT Practice Question Set #26 (Question 76-78)

Critical Reasoning Question #77: Baby Shampoo  
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Quaternium-15, a formaldehyde-releasing preservative used in some baby shampoos, is carcinogenic for mice, but only when it is used in very large quantities. To absorb an amount of Quaternium-15 equivalent to the amount given to the mice in the relevant studies, a baby would have to wash his or her hair 25 times per day. For that reason, Quaternium-15 is in fact safe for babies.

For which of the following assumptions does the argument that Quaternium is safe for babies depend?


Cancer from carcinogenic substances develops more slowly in mice than it does in people.


If all chemicals that are currently used in soap and other cleaning dispensers were tested, some would be found to be carcinogenic for mice.


Babies have their hair washed fewer than 25 times per day with baby shampoo that contains formaldehyde-releasing preservatives.


Parents benefit from the preservatives added in baby shampoo because they help extend the life of the shampoo bottle so that they do not need to buy new shampoo every day.


Some of the studies done on Quaternium-15 were not relevant to the question of whether or not Quaternium-15 is carcinogenic for babies.

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