In an Experiment with Depressed Patients,doctors Gave Some Participants Antidepressant

In an experiment with depressed patients,doctors gave some participants antidepressant pills while others received an identical pill with no active ingredients.Neither doctors nor patients knew who got what.If both groups improved substantially but equally,this is strong evidence that

A) the "active ingredient" has no effect.
B) any effect of the antidepressant pill is due to patients' expectations.
C) of the need for placebo controls in drug research.
D) all of the above

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