Question

Which of the following describes the placebo effect?

A. An experiment is repeated many times with real drugs and placebos.
B. Subjects may respond to a treatment simply because they believe it is affecting them.
C. At least one block of subjects in an experiment receives only placebos.
D. Subjects receive inactive sugar pills instead of real medication.
E. Subjects are prevented from knowing whether they are receiving real drugs or placebos.