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 murmur of hyperophic obstructive cardiomyopathy is decreased in which of the following: 
Select and explain. 
A. Supine position, B. Standing position, C. Valsalva maneuver, D. Amyl nitrate inhalation
A: Supine position
Answer: A: Supine position 
Explanation: Answer is A (Supine position) Condition which increase obstruction & intensity of murmur Factors that increase myocardial contractility ExerciseQ Sympathomimetic Aminese Digitalis Glycosidese Factors which decrease Ventricular volume Valsalva maneuverQ Sudden standing0 Nitroglycerines Amyl nitrites Tachycardiac Decreased aoic impedance & afterload: Conditions which decrease obstruction & intensity of murmur Factors that decrease myocardial contractility B blockers calcium channel blockers Factors which increase Ventricular volume Augmentation of venous return by passive leg raisinge Expansion of Blood Volumee Supine PositionQ Increased aoic impedance & afterload: Elevation of Aerial pressure by phenylephrinee Sustained hand gripe Squatting