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
[{'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 hypertrophic 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: None', 'role': 'assistant'}]