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: Orthopaedics
[{'content': 'Osteochondroma arises from \nSelect and explain. \nA. Medullary cavity, B. Diaphysis, C. Metaphysis, D. Epiphysis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]