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. He consumes foods that supply tryptophan, which his liver converts to preformed vitamin A.
B. His fat cells synthesize preformed vitamin A from essential fatty acids.
C. His body does not require sources of vitamin A.
D. He eats plenty of foods that contain beta-carotene.
Answer: D
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