Matt is a vegan. As a result of his diet, he consumes no sources of preformed vitamin A. Which of the following statements explains why he has not developed a deficiency of vitamin A?
A. Matt eats plenty of vitamin B-enriched cereal products.
B. Matt's diet is rich in vitamin C, which reduces his need for vitamin A.
C. Matt's diet supplies high amounts of beta-carotene.
D. Matt's diet contain high amounts of tryptophan.
Answer: C
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