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
Acute aoic regurgitation is seen in all the following except 
Select and explain. 
A. Marfan's syndrome, B. Acute myocardial infraction, C. Bacterial endocarditis, D. Ankylosing spondylitis
B: Acute myocardial infraction
Answer: B: Acute myocardial infraction 
Explanation: Ref Harrison 19 th ed pg 1535 acute severe AR, as may occur in infective endo- carditis, aoic dissection, or trauma, the LV cannot dilate sufficiently to maintain stroke volume, and LV diastolic pressure rises rapidly with associated marked elevations of LA and PA wedge pressures. Pulmonary edema and/or cardiogenic shock may develop rapidly.