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
[{'content': 'The commonest long term complication causing mortality after urinary diversion is: \nSelect and explain. \nA. Renal failure due to pyelonephritis, B. Persistent electrolyte imbalance, C. Colonic carcinoma, D. BIL renal calculi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]