This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins, Subject name: Biochemistry
[{'content': 'Vitamin synthesized from tryptophan - \nSelect and explain. \nA. Thiamine (Vitamin B1), B. Riboflavin (Vitamin B2), C. Niacin (Vitamin B3), D. Pyridoxin (Vitamin B6)', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Niacin (Vitamin B3) o Tryptophan is oxidized to kynurenine, which is then converted to either niacin (nicotinic acid) or acetyl-CoA. In the reaction alanine is also produced.o Deficiency of tryptophan can cause deficiency of niacin (if also deficient in diet). This can leads to Pallegra: dermatitis, diarrhea and dementia.o For every 60 mg of tryptophan, 1 mg. equivalent of niacin can be generated.", 'role': 'assistant'}]