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': 'Most common cause of acute mesenteric ischemia is: \nSelect and explain. \nA. Arterial thrombosis, B. Venous thrombosis, C. Embolism, D. Non occlusive disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Acute Mesenteric Ischemia :\n• Emboli (50%) :\n−− Arrhythmia, Valvular disease, Myocardial infarction\n−− Hypokinetic ventricular wall\n−− Cardiac aneurysm, Aortic atherosclerotic disease\n• Thrombosis (25%) : Atherosclerotic disease\n• Nonocclusive (5–15%) :\n−− Pancreatitis, Heart failure, Sepsis.\n−− Cardiac bypass, Burns, Renal failure.\n• Venous occlusion:\n−− Hypercoagulable state.\n−− Sepsis Compression, Pregnancy, Portal hypertension.', 'role': 'assistant'}]