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 maneouvre aEUR' 
Select and explain. 
A. Mitral stenosis, B. HOCM, C. VSD, D. Aoic stenosis
B: HOCM
Answer: B: HOCM 
Explanation: HOCM EFFECT OF VARIOUS INTERVENTIONS ON SYSTOLIC MURMURS