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: Biochemistry
[{'content': 'Which of the following are necessary for Niacin synthesis \nSelect and explain. \nA. Tryptophan, B. Vitamin B2, C. Vitamin B6, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 60 mg Tryptophan = 1 mg Niacin\n2 x 3 = 6\xa0\nSynthesis of vitamin B3 requires B2 and B6.', 'role': 'assistant'}]