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
The systolic ejection murmur in hyperophic obstrucive cardiomyopatthy is diminished when a patient- 
Select and explain. 
A. Performs the Valsalva maneuver, B. Lies down, C. With squating, D. Stands up
C: With squating
Answer: C: With squating 
Explanation: The physical examination typically reveals a harsh murmur heard best at the left lower sternal border, arising from both the outflow tract turbulence during ventricular ejection and the commonly associated mitral regurgitation. The gradient and the murmur may be enhanced by maneuvers that decrease ventricular volume, such as the Valsalva maneuver, or standing after squatting. They may be decreased by increasing ventricular volume or vascular resistance, such as with squatting or handgrip. ( Harrison&;s principle of internal medicine,18th edition,pg no. 1968)