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': 'Continuous murmur is seen in all the  following            \n\nexcept- \nSelect and explain. \nA. Coarctation of Aorta, B. Aortic sinus of valsalva rupture, C. AV malforniations, D. Peripheral pulmonary stenosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A continuous murmur is predicated on\na pressure gradient that persists between\ntwo cardiac chambers or blood vessels\nacross systole and diastole. The murmurs\ntypically begin in systole, envelop the\nsecond heart sound (S 2 ), and continue\nthrough some portion of diastole. They\ncan often be difficult to distinguish from\nindividual systolic and diastolic murmurs\nin patients with mixed valvular heart disease.\nThe classic example of a continuous\nmurmur is that associated with a patent\nductus arteriosus, which usually is heard\nin the second or third interspace at a slight\ndistance from the sternal border. Other\ncauses of a continuous murmur include\na ruptured sinus of Valsalva aneurysm\nwith creation of an aortic–right atrial\nor right ventricular fistula, a coronary\nor great vessel arteriovenous fistula, and\nan arteriovenous fistula constructed to\nprovide dialysis access.', 'role': 'assistant'}]