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': 'Radiosensitive bone tumor \nSelect and explain. \nA. Fibrosarcoma, B. Malignant GIT, C. Multiple myeloma, D. Synovial cell sarcoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]