This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'One mg. of Niacin is produced by.......................... mg. of Tryptophan- \nSelect and explain. \nA. 22, B. 37, C. 55, D. 60', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 60 About 60 mg of tryptophan is required to result in I mg of niacin.", 'role': 'assistant'}]