Researchers are conducting a study to determine the effects of zinc supplements on the human immune system.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)placebos.
B)supplements.
C)probiotics.
D)antidotes.

Question

Quizplus · Accepted Answer

Placebos are inactive substances, such as sugar pills, that are given to one group of subjects in a study to act as a control group. Placebos are important in studies because they help researchers to determine whether the effects observed in the treatment group are due to the intervention being studied, or if they are simply a result of the subjects' belief that they are receiving treatment. In this study, the group of subjects who receive pills that do not contain zinc are receiving placebos.

Researchers Are Conducting a Study to Determine the Effects of Zinc