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': 'Osteoclastoma arises from which pa of bone? \nSelect and explain. \nA. Epiphysis, B. Metaphysis, C. Diaphysis, D. All the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: OSTEOCLASTOMA (GIANT CELL TUMOUR) Giant cell tumour (GCT) is a common bone tumour with variable growth potential. Though generally classified as benign*, it tends to recur after local removal. The tumour is seen commonly in the age group of 20-40 years i.e., after epiphyseal fusion. The bones affected commonly are those around the knee i.e., lower-end of the femur and upper-end of the tibia. Lower-end of the radius is another common site. The tumour is located at the epiphysis**. It often reaches almost up to the joint surface. Common presenting complaints are swelling and vague pain Reference: Maheshwari; Essential Ohopaedics; Page no: 237', 'role': 'assistant'}]