This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'content': "Secondary osteosarcoma is associated with \nSelect and explain. \nA. Paget's disease, B. Osteogenesis imperfect, C. Melhoreostosis, D. Anklyosing spondylitis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Causes of secondary osteosarcomaPaget&;s DiseaseFibrous dysplasiaRadiationEnchondromatosisHereditary multiple exostosesChronic osteomyelitisBone infarction (Refer: Manish Kumar Varshney's Essential Ohopedics Principles & Practice, 1st edition, pg no. 191, 192)", 'role': 'assistant'}]