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

Question

Quizplus · Accepted Answer

Placebos are inactive substances that are used as a control in medical studies to determine the effectiveness of an intervention. In this case, the pills that do not contain vitamin D are being used as a control to compare the effects of vitamin D supplements on the immune system. Therefore, option A is the correct answer. The other options (B, C, and D) are not relevant to this study.

Researchers Are Conducting a Study to Determine the Effects of Vitamin