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: Pediatrics
Pre-cancerous lesion of bone? 
Select and explain. 
A. Paget disease, B. Chronic osteomyelitis, C. Benign giant cell tumor, D. All of above
D: All of above
Answer: D: All of above 
Explanation: Ans. is 'd' i.e., All of above Pre-cancerous lesion of bone Multiple exostoses Ollier's disease Benign giant cell tumor Osteoblastoma Chondroblastoma Chronic osteomyelitis Paget's disease