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
Acute Aoic regurgitation is seen in all the following except: 
Select and explain. 
A. Marfan's syndrome, B. Acute myocardial infarction, C. Bacterial endocarditis, D. Ankylosing spondylitis
B: Acute myocardial infarction
Answer: B: Acute myocardial infarction 
Explanation: Answer is B (Acute myocardial infarction) All options other than acute myocardial infarction are known causes for acute aoic regurgitation. Aoic regurgitation may result from Two Major Mechanisms : allow regurgitation of blood back into LV. I. By causing valvular deformities. This is the most common cause 2. By deforming the aoic root.