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: Surgery
Murmur increasing with Valsalva manouvre aEUR' 
Select and explain. 
A. VSD, B. HOCM, C. MS, D. AS
B: HOCM
Answer: B: HOCM 
Explanation: HOCM EFFECT OF VARIOUS INTERVENTIONS ON SYSTOLIC MURMURS Valsalva maneuver Most murmurs decrease in length and intensity with valsalva mane- uver. Two exceptions are:? - HOCM --> becomes louder - Mitral valve prolapse - becomes longer and louder Mitral Regurgitation The systolic murmur of M.R. is reduced during the strain phase of valsalva maneuver.