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. probiotics.
C. supplements.
D. placebos.
Answer: D
Nutritional Science
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Fill in the blank(s) with correct word
Nutritional Science