This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney and ureter, Subject name: Surgery
[{'content': 'Percutaneous nephrostomy in indicated in: \nSelect and explain. \nA. Polycystic kidney disease, B. Solitary adenocarcinoma, C. Simple hydronephrosis, D. Pyonephrosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Management of Pyonephrosis Immediate institution of antibiotics therapy and drainage of the infected collecting system. Antibiotics should be staed before manipulation of the urinary tract. In the ill patient, drainage of the collecting system with a percutaneous nephrostomy tube. Nephrectomy in destroyed or non-functioning kidney.', 'role': 'assistant'}]