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: Medicine
Necrotizing papilitis is seen in all of the following except- 
Select and explain. 
A. Salicylate poisoning, B. Renal vascular thrombosis, C. PNH, D. Diabetes mellitus
C: PNH
Answer: C: PNH 
Explanation: None