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
Murmur increasing with valsalva maneouvre 
Select and explain. 
A. Mitral stenosis, B. HOCM, C. M.R., D. Aortic stenosis
B: HOCM
Answer: B: HOCM 
Explanation: None