Q. Which out of the following amino acid is a precursor of niacin (Vitamin)?
A. Tyrosine
B. Threonine
C. Tryptophan
D. Phenylalanine
Answer: Tryptophan
A. Tyrosine
B. Threonine
C. Tryptophan
D. Phenylalanine
Answer: Tryptophan
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