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: Surgery
[{'content': 'Whicn is not a marker of new bone formation? \nSelect and explain. \nA. Alkaline phosphatase, B. Osteocalcin, C. Urine hydroxyproline, D. Pro collagen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Urine hydroxyl proline', 'role': 'assistant'}]