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 Aortic regurgitation is seen in all of 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: None