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: Medicine
[{'content': 'Budd Chiari syndrome is: March 2013 \nSelect and explain. \nA. Poal vein thrombosis, B. Hepatic aery thrombosis, C. Cystic aery thrombosis, D. Hepatic vein thrombosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Hepatic vein obstruction', 'role': 'assistant'}]