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': 'Epiphyseal tumor is - \nSelect and explain. \nA. Osteoclastoma, B. Chondromyxoid fibroma, C. Osteosarcoma, D. Ewing sarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: GCT is an osteolytic tumor arising from the epiphysis and is common between the age of 20-40 years.', 'role': 'assistant'}]