Researchers are conducting a study to determine the effects of zinc supplements on migraines in adults.The study involves providing pills that contain zinc to one group of human subjects,and pills that do not contain zinc or other active ingredients to another group of people.The pills that do not contain zinc are
A)probiotics.
B)supplements.
C)antidotes.
D)placebos.

Question

Quizplus · Accepted Answer

Placebos are inactive substances that have no medical effect but are given to the control group in clinical trials to determine the effectiveness of the active drug or treatment being tested. In this study, the group that receives pills without zinc is the control group, and they will receive placebos that do not contain any active ingredients.

Researchers Are Conducting a Study to Determine the Effects of Zinc