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': 'Metaphyseal tumor among the following \nSelect and explain. \nA. Osteoclastoma in adults, B. Multiple myeloma, C. Osteosarcoma, D. Osteoid osteoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]