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

Question

Quizplus · Accepted Answer

The pills that do not contain vitamin C or other active ingredients are placebos, which are often used in medical research as a comparison group to determine the true effects of a treatment.

Researchers Are Conducting a Study to Determine the Effects of Vitamin