The "gold standard" of drug efficacy studies is the double-blind, placebo-controlled design. Which of the following most likely prevents our ability to reach firm conclusions? A) We cannot conduct this type of research due to federal rules regarding research ethics. B) Participants can usually tell the difference between an active drug and a placebo. C) Observers typically know which participants are taking the placebo. D) Most of the drugs we wish to test are technically illegal.

The "gold standard" of drug efficacy studies is the double-blind, placebo-controlled design. Which of the following most likely prevents our ability to reach firm conclusions? A) We cannot conduct this type of research due to federal rules regarding research ethics. B) Participants can usually tell the difference between an active drug and a placebo. C) Observers typically know which participants are taking the placebo. D) Most of the drugs we wish to test are technically illegal.

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