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': 'Vitamin required for hydroxyproline to proline conversion: \nSelect and explain. \nA. Vitamin C, B. Vitamin E, C. Pvrodoxal PO4, D. Biotin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Vitamin C', 'role': 'assistant'}]