This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Disorders Leading to Osteosclerosis, Subject name: Orthopaedics
[{'content': "Secondary osteosarcoma are associated with - \nSelect and explain. \nA. Paget's disease, B. Osteogenesis imperfecta, C. Melhoreostosis, D. Ankylosing spondylitis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Paget's disease Causes of secondary osteosarcomao Pagets Diseaseo Fibrous dysplasiao Radiationo Enchondromatosiso Hereditary multiple exostosiso Chronic osteomyelitiso Bone infarction", 'role': 'assistant'}]