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: Surgery
[{'content': 'The operation that precipitates poosystemic encephalopathy is - \nSelect and explain. \nA. Splenorenal shunt, B. Siguira operation, C. Talma-Marison Operation, D. Poacaval anastomosis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Poacaval anastomosis", 'role': 'assistant'}]