This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The murmur of hyperophy cardiomyopathy is decreased in which of the following \nSelect and explain. \nA. Supine position, B. Standing position, C. Valsalva maneuver, D. Amyl nitrate inhalation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 19 th ed pg 1568 The systolic ejection murmur of left ventricular outflow tract obstruction is harsh and late peaking and can be enhanced by bedside maneuvers that diminish ventricular volume and transiently worsen obstruction, such as stand- ing from a squatting position or the Valsalva maneuver.', 'role': 'assistant'}]