Dr Anh Decides to Test Her Drug, Sarzone, Against a Placebo

Dr. Anh decides to test her drug, Sarzone, against a placebo in two randomly selected patient groups. She finds that in both patient groups, 20 percent of the patients reported fewer symptoms. This finding illustrates that:

A) drugs are often ineffective in treating illness
B) Dr. Anh made some mistakes in her research design
C) patient expectations have little to do with the drug effects
D) patient expectations account for the drug effects