Promelute, a Pharmaceutical Company, Conducts a Research on Participants for Its

Promelute, a pharmaceutical company, conducts a research on participants for its new drug for obsessive-compulsive disorder. But the experimenter is unclear about the conclusions of the study because he is not sure if the improvement has been caused by the properties of the drug or by the participants' expectations about the effect of the drug. Such an effect is known as a(n) _____ effect.

A) order
B) placebo
C) ceiling
D) fatigue

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