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
In which condition intensity of systolic murmur is incre ased- 
Select and explain. 
A. Hyperophic cardiomathy, B. Severe AS, C. MS, D. AR
B: Severe AS
Answer: B: Severe AS 
Explanation: The intensity of functional systolic ejection murmurs varies, but generally ranges from grades 1 to 3. The intensity typically increases during phase 3 (release phase) of the Valsalva maneuver, following a post-extrasystolic pause and after inhalation of amyl nitriteand AS conditions Ref Davidson 23rd edition pg 455