Promelute Inc., a pharmaceutical company, conducts a research on participants for its new drug for the treatment of obsessive–compulsive disorder. The researcher is unclear about the results of the study because he is not sure if the improvement results from the properties of the drug or from the participants' expectations about the effect of the drug. Such an effect is known as a(n) effect.

Such an effect is known as a PLACEBO effect.

Explanation:

Promelute Inc., a pharmaceutical company, conducts a research on participants for its new drug for the treatment of obsessive–compulsive disorder. The researcher is unclear about the results of the study because he is not sure if the improvement results from the properties of the drug or from the participants' expectations about the effect of the drug. Such an effect is known as a PLACEBO effect.

The placebo effect is defined as a phenomenon in which some people experience a benefit after the administration of an inactive substance or sham treatment.

A placebo is a substance with no known medical effects, such as sterile water, saline solution, or a sugar pill.

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