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': "Osteosarcoma can develop in: \nSelect and explain. \nA. Osteoid osteoma, B. Osteoblastoma, C. Paget's disease, D. All of the above", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans: c (Paget's disease) Ref: Maheswari, 4th ed,p. 221Osteosarcoma can develop secondary to premalignant diseases of the bone.They are usually less malignant & seen in the older age group.Premalignant lesions are:* Paget's disease* Diaphyseal aclasis* Enchondromatosis* Post radiation", 'role': 'assistant'}]