This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Manifestations of acute dissection include all of the following except \nSelect and explain. \nA. Pericardial tamponade, B. AR, C. MR, D. AMI', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref Harrison 19 th ed pg 1640 Hemopericardium and cardiac tamponade may complicate a type A lesion with retrograde dissection. Acute aoic regurgitation is animpoant and common (>50%) complication of proximal dissection. An electrocardiogram that shows no evidence of myocardial ischemia is helpful in distinguishing aoic dissection from myocardial infarction', 'role': 'assistant'}]