Both subjects and researchers participating in the drug r and generalized anxiety disorder (gad) study are blinded as to whether the subject is receiving drug r, the comparator, or the placebo. this is known as the:

I believe the answer is: double blind procedures

double blind procedures refers to a form of study in which both participants and the researchers do not know which subjects are receiving the treatment. The purpose of double blind procedures is to prevent the bias held by the experimenters along with placebo effects.