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: Pathology
[{'content': "A patient with which of the follwing disease is predisposed to develop osteosarcoma -a)  Osteomalaciab)  Osteomyelitisc)  Paget's disease of boned)  Osteopetrosis \nSelect and explain. \nA. a, B. c, C. bc, D. ad", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Osteosarcoma (osteogenic sarcoma - OGS) \n\nOsteosarcoma is primary malignant bone tumor of bone, derived from primitive bone forming mesenchyma and characterized by osteoid formation.\nIt is of two types\n\n\nPrimary\nSecondary\n\n\nPaget disease\nRadiation\nFibrous dysplasia\nEnchondromatosis\nMultiple osteochondroma\nBone infarction\nChronic osteomyelitis', 'role': 'assistant'}]