This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Valvular hea diseases, Subject name: Medicine
What happens to Austin flint murmur after exposure of vasodilators? 
Select and explain. 
A. Accentuated, B. Softer, C. Longer duration, D. Shoer duration
B: Softer
Answer: B: Softer 
Explanation: Defective aoic valve closure and blood coming back in the ventricular chamber. | Severe Aoic Regurgitation | Austin Flint murmur | When vasodilator is used -Dilate aoa & pressure | in Aoa-Less blood flows back & murmur is softer. Note: All murmurs | in intensity with Valsalva standing & Amyl nitrate Except HOCM= Louder MVP= Longer