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: Unknown
The commonest long term complication causing mortality after urinary diversion is: 
Select and explain. 
A. Renal failure due to pyelonephritis, B. Persistent electrolyte imbalance, C. Colonic carcinoma, D. BIL renal calculi
A: Renal failure due to pyelonephritis
Answer: A: Renal failure due to pyelonephritis 
Explanation: None