This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'A 16 year old male is referred by high school coach for a physical examination before joining the football team. His elder brother had died suddenly during football practise, no autopsy was done. The patient has a loud systolic murmur on chest auscultation. All of the following would be constant with hyperophic cardiomyopathy, except- \nSelect and explain. \nA. A crescendo-decrescendo systolic murmur, B. Murmur radiating to neck, C. Brisk carotid upstroke, D. Increase in murmur during valsalva or standing', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref: Harrison's 19th E pg 1568 Murmur of HOCM doesn't radiate to neck. Hyperophic cardiomyopathy is defined as left ventricular hyperophy that develops in the absence of causative hemodynamic factors, such as hypeension, aoic valve disease, or systemic infiltrative or storage diseases", 'role': 'assistant'}]