Researchers are conducting a study to determine the effects of vitamin D supplementation on bone health in adults. 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. interventions.
B. placebos.
C. distractors.
D. antidotes.


Answer: B

Nutritional Science

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