This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acids Basics, Subject name: Biochemistry
[{'content': 'Vitamin synthesized from amino acid is? \nSelect and explain. \nA. Thiamine, B. Riboflavin, C. Biotin, D. Niacin', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) NiacinRef Harper's Biochemistry 28/e, chapter 44", 'role': 'assistant'}]