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': 'Pathologic fracture can occur in all except: \nSelect and explain. \nA. Metabolic bone disease, B. Osteosarcoma, C. Osteochondroma, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Osteochondroma', 'role': 'assistant'}]