An Important Aspect of a Randomized, Double-Blind, Placebo-Controlled Study Is

Multiple Choice

An important aspect of a randomized, double-blind, placebo-controlled study is that subjects

A) must receive both treatment and placebo.
B) must be blinded as to whether they are in the treatment or placebo group.
C) must be assigned to the treatment or control group by the investigator.
D) must be aware of whether they are receiving the treatment or placebo.