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: Surgery
Secondary osteosarcoma are associated with 
Select and explain. 
A. Paget's disease, B. Osteogenesis imperfecta, C. Melhoreostosis, D. Ankylosing spondilitis
A: Paget's disease
Answer: A: Paget's disease 
Explanation: Answer- A. Paget's diseaseCauses of secondary osteosarcomaPagets DiseaseFibrous dysplasiaEnchondromatosisHereditary multiple exostosisRadiationChronicosteomyelitisBone infarction