This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Giant Cell Tumor (GCT) or Osteoclastoma, Subject name: Orthopaedics
[{'content': 'Which of the follow ing is an epiphyseal lesion? \nSelect and explain. \nA. Chondroblastoma, B. Chondrosarcoma, C. Fibrosarcoma, D. Non ossifying fibroma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Chondroblastoma o See above explanation.", 'role': 'assistant'}]