What is a "double-blind" study?
A. Each patient receives both the drug being tested and a placebo, so that the effects of the drug can be compared to the effects of the patient's expectations.
B. While the patient is aware of the treatment they are receiving, their family, friends, and therapist are not.
C. Neither the patient being given the drug nor the researcher who will evaluate the drug's effects knows whether the patient is receiving the treatment or the placebo.
D. Two conditions are used, a treatment and a placebo.
Answer: C
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