This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
[{'content': 'Vitamin C is present in largest amount in body in \nSelect and explain. \nA. Eye, B. Kidney, C. Testis, D. Adrenal coex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Reference: Harpers illustrated biochemistry 30th edition', 'role': 'assistant'}]