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)supplements.
C)placebos.
D)probiotics.

Question

Quizplus · Accepted Answer

Placebos are inactive substances that do not contain any active ingredient. In this study, one group of people is given pills that do not contain vitamin C or any other active ingredient, which makes them placebos. This allows researchers to compare the effects of vitamin C in the other group receiving pills containing the vitamin. The other answer options (A, B, and D) are not relevant in this context.

Researchers Are Conducting a Study to Determine the Effects of Vitamin