A pharmaceutical company is conducting an experiment to test the effectiveness of a tricyclic antidepressant. Which of the following, if true, would indicate that the experimenters used a placebo?
A. The research assistants who administered the drugs were asked to establish rapport with the participants.
B. The participants in both groups did not know if they were getting a real or a false treatment.
C. The participants were assigned to the experimental or control groups by drawing lots.
D. The participants were informed about the medication they would be taking and its possible side effects before starting the treatment.
Answer: B
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