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': 'Budd Chiari syndrome is due to thrombosis of ? \nSelect and explain. \nA. Infra renal IVC, B. Renal pa of IVC, C. Superior mesentric vein thrombosis, D. Hepatic veins', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Hepatic veins", 'role': 'assistant'}]