This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Budd chiari syndrome & Pancreatitis, Subject name: Medicine
[{'content': 'In Budd-Chiari syndrome there is obstruction to : \nSelect and explain. \nA. Inferior vena cava, B. Hepatic aery, C. Larger hepatic veins, D. Poal vein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Budd-Chiari syndrome results from obstruction to the hepatic veins. Vaso-occlusive thrombosis occurs in hepatic vein - spreads to C/L hepatic veins - then in IVC Thrombus formation in hepatic veins - Backward pressure - centrilobular necrosis formation', 'role': 'assistant'}]