Why Has It Been Difficult to Do Double-Blind, Placebo-Controlled Studies

Multiple Choice

Why has it been difficult to do double-blind, placebo-controlled studies on the effects of steroids?

A) The federal government will not allow research with controlled substances
B) They produce detectable psychological effects, so the participants can tell when they are being given the steroid and when they are being given the placebo
C) The potency of the drugs is so variable from one sample to another
D) The researchers could face a massive lawsuit