This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': "Graham Steel's murmur is an ausultatory finding of \nSelect and explain. \nA. Aortic regurgitation, B. Pulmonary regurgitation, C. Tricuspid incompetence, D. Aortic stenosis", 'role': 'user'}, {'content': "Answer: B \nExplanation: (B) Pulmonary regurgitation > Graham Steell's murmur: a high-pitched diastolic murmur caused by pulmonary regurgitation secondary to severe pulmonary hypertension; it is heard at the left sternal edge, level with the second or third costal cartilage.> Duroziez's murmur: a double murmur over the femoral or other large peripheral artery, due to aortic insufficiency.> Cruveilhier-Baumgarten murmur: a venous murmur heard at the abdominal wall over veins connecting the portal and caval systems.> Carey Coombs murmur: a rumbling apical mid-diastolic cardiac murmur occurring in the acute phase of rheumatic fever and disappearing afterward.> Austin Flint murmur: a presystolic or mid-diastolic murmur heard at the cardiac apex in aortic regurgitation, originating at the mitral valve when blood enters simultaneously from both the aorta and the left atrium.> Gibson murmur or Machinary murmur: a long rumbling sound occupying most of systole and diastole, usually localized in the second left interspace near the sternum, and usually indicative of patent ductus arteriosus> Seagull murmur: a raucous murmur with musical qualities resembling the call of a seagull such as that heard occasionally in aortic insufficiency, and attributed specifically to eversion or retroversion of the right anterior aortic cusp.", 'role': 'assistant'}]