This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Following drugs are known to produce osteonecrosis EXCEPT 
Select and explain. 
A. Glucocoicoids, B. Alcohol, C. Cytotoxicoids, D. NSAIDs
D: NSAIDs
Answer: D: NSAIDs 
Explanation: these NSAID's cause gastric irritation and may risk the gastric bleeding. NSAIDs are non-specific cyclo-oxygenase inhibitors. So gastric protection and platelet function are lost.NSAIDS can also precipitate attacks of bleeding ulcers. ref:SRB&;s manual of surgery,ed 3,pg no 299