Which out of the following amino acid is a precursor of niacin (Vitamin)?

Which out of the following amino acid is a precursor of niacin (Vitamin)?

Q. Which out of the following amino acid is a precursor of niacin (Vitamin)?

A.            Tyrosine

B.            Threonine

C.            Tryptophan

D.            Phenylalanine

Answer: Tryptophan

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