Answer:
The group receiving the placebo is known as the control group
Step-by-step explanation:
The type of medical study described in the question is known as a placebo-controlled study, which has to do with a group of subjects receiving the actual drug to be tested and another group known as the control group receives a fake (placebo) treatment and they are used in blinded trials where the participants do not know whether they are receiving the real or sham treatment. Placebos are used to rule out the placebo effect, which is the effect on the receipientof the treatment which is not caused by the actual treatment itself, this is important to rule out external or extreneous effects that interfere with treatment arising from factors other than the treatment itself. Without the placebo (control) group, it would be imossible t to know whether the treatment itself had any effect.
Some studies incorporate a third group known as "natural group" that do not receive any treatment whatsoever.