This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Renal papillary necrosis is almost associated with the following condition 
Select and explain. 
A. Diabetes mellitus, B. analgesicnephroathy, C. Chronic pyelonephritis, D. Post streptococcal GN
A: Diabetes mellitus
Answer: A: Diabetes mellitus 
Explanation: Refer p 936 Most common cause of papillary necrosis is diabetes mellitus Acute papillary necrosis is most often a complication of acute pyelonephritis in diabetes. Chronic papillary necrosis is seen in assoscation with analgesic nephropathy