Barry is a vegan. His diet does not include foods that contain preformed vitamin A, and he does not take any vitamin A supplements. Nevertheless, his body has adequate vitamin A stores. Which of the following statements provides the best explanation for Barry's adequate vitamin A status?
A. His fat cells synthesize preformed vitamin A from essential fatty acids.
B. His body does not require sources of vitamin A.
C. He consumes foods that supply tryptophan, which his liver converts to preformed vitamin A.
D. He eats plenty of foods that contain beta-carotene.
Answer: D
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