There can be multiple comparison groups in a randomized trial. a. true b. false

The answer is true. Of all the numerous ways research can be directed, the best quality level of evidence where medications and treatments are concerned is the Randomized Controlled Trial. A Randomized Controlled Trial is a test or study directed such that whatever number wellsprings of predisposition as could reasonably be expected are expelled from the procedure.

C- a hypothesis or d- an observation