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': 'The major disadvantage of mesenteric angiography in the setting of GI bleeding is: \nSelect and explain. \nA. It does not identify the specific cause of the bleeding, B. Embolization is not possible, C. Vasopressin infusion is not possible, D. Transient ischemic attacks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angiography can be used to diagnose and treat severe bleeding. It can be diagnostic, only when the aerial bleeding rate is at least 0.5 mL/min. The sensitivity is 30% to 50% The specificity is 100%. Advantage It permits therapeutic intra-aerial infusion of vasopressin Transcatheter embolization for hemostasis. Disadvantage: Complications-3% Hematoma formation Femoral aery thrombosis Contrast dye reactions Acute kidney injury Intestinal ischemia Transient ischemic attacks Does not identify the specific cause of bleedin', 'role': 'assistant'}]