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': 'Which of the following is the site of Venous Thrombosis in Budd Chiari Syndrome? \nSelect and explain. \nA. Infrahepatic inferior vena cava, B. Infrarenal inferior vena cava, C. Hepatic vein, D. Poal vein', 'role': 'user'}, {'content': "Answer: C \nExplanation: Budd-Chiari Syndrome (BCS) is an uncommon congestive hepatopathy caused by the obstruction of hepatic venous outflow. Patients may present with acute signs and symptoms of abdominal pain, ascites, and hepatomegaly or more chronic symptoms related to long-standing poal hypeension. The obstruction may be thrombotic or nonthrombotic anywhere along the venous outflow system from the hepatic venules to the right atrium. Ref: Current Medical Diagnosis and Treatment, 2012, Chapter 16 ; Scwaz's Principles of Surgery, 9th Edition, Chapter 31", 'role': 'assistant'}]