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Problem 1 - Entrance Test

A study concludes that a new drug significantly reduces the risk of a rare disease by 40%. Critics argue that the study's results are flawed because the trial group was healthier than the general population at baseline. Which of the following, if true, would most weaken the critics' argument?

Correct: A

The critics' objection hinges on the trial group's health status biasing results. Controlling for preexisting conditions directly addresses the health baseline issue, making the comparison between groups valid and weakening the critics' claim. Other options do not address the fundamental confounding variable of baseline health disparities.