This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
[{'content': 'Which of the following is an epiphyseal tumor? \nSelect and explain. \nA. Osteoid osteoma, B. Adamantinoma, C. Osteosarcoma, D. Chondroblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. ChondroblastomaCHONDROBLASTOMA* This benign tumor of immature cartilage cells is one of the few lesions to appear primarily in the epiphysis, usually of the proximal humerus, femur or tibia.* The presenting symptom is a constant ache in the joint; the tender spot is actually in the adjacent bone.* X-ray shows a rounded, well-demarcated radiolucent area in the epiphysis with no hint of central calcification.', 'role': 'assistant'}]