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
The systolic ejection murmur in hypertrophic obstructive cardiomyopathy is diminished when a patient - 
Select and explain. 
A. Performs the valsalva maneuver, B. Lies down, C. Inhales amyl nitrite, D. Stands up
B: Lies down
Answer: B: Lies down 
Explanation: None