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
[{'content': "Murmur increasing with Valsalva manouvre aEUR' \nSelect and explain. \nA. VSD, B. HOCM, C. MS, D. AS", 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]