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)antidotes.
B)placebos.
C)probiotics.
D)supplements.

Question

Quizplus · Accepted Answer

Placebos are inactive substances (such as sugar pills) that are given to a control group in a study to compare the effects of the active treatment. In this case, the pills that do not contain vitamin C or other active ingredients are given to the control group as a placebo.

Researchers Are Conducting a Study to Determine the Effects of Vitamin