Scientists at a major university have isolated a chemical from grapes. Which of the following features is an indication that this chemical could be a vitamin?
A. When large amounts of the chemical are consumed, no health problems occur.
B. When a person's diet lacks the chemical, his or her body experiences abnormal functioning.
C. The chemical is in grapes, cherries, and tomatoes.
D. The chemical has a very limited range of safe intake.
Answer: B
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