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': 'True about Niacin is \nSelect and explain. \nA. Oral manifestation of its deficiency is Raw beefy tongue, B. 60 mg of tryptophan is equivalent to 1 mg of Niacin, C. Deficiency cause pellagra, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]