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
The operation that precipitates poosystemic encephalopathy is - 
Select and explain. 
A. Splenorenal shunt, B. Siguira operation, C. Talma-Marison Operation, D. Poacaval anastomosis
D: Poacaval anastomosis
Answer: D: Poacaval anastomosis 
Explanation: Ans. is 'd' i.e., Poacaval anastomosis