This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Orthopaedics
[{'content': 'what is the cause of Most common bone cancer among young men is \nSelect and explain. \nA. Chondrosarcoma, B. Ewing sarcoma, C. Osteosarcoma, D. Giant cell tumor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most common bone tumor in young male ----Osteosarcoma Refer Maheshwari 9th/e p 239', 'role': 'assistant'}]