This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Treatment of choice for extrahepatic poal thrombosis \nSelect and explain. \nA. Mesocaval shunt, B. Poocaval shunt, C. Mesorenal shunt, D. Splenorenal shunt', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Since obstruction is in the poal vein, to bypass the obstruction the shunt should be preferably REX shunt (mesenteric-left poal shunt) Splenorenal shunt is also done in EHPVO but in 50% of patients of EPHVO, splenic vein is thrombosed, not available for splenorenal shunt', 'role': 'assistant'}]