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': 'Bone forming tumors are -a) Osteosarcomab) Osteoid osteomac) Giant cell tumourd) Osteoblastomae) Chondrosarcoma \nSelect and explain. \nA. abd, B. bcd, C. abc, D. ab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bone forming tumors \n\nBenign : - Osteoma, Osteoid osteoma, Osteoblastoma.\nMalignant : - Osteosarcoma', 'role': 'assistant'}]