This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hea Sounds, Subject name: Medicine
[{'content': 'Which is not a feature of chronic mitral regurgitation? \nSelect and explain. \nA. Mid-diastolic murmur, B. Wide split S2, C. PanSystolic murmur radiating to axilla, D. Narrow split S1', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mitral Regurgitation, the extra blood that flows into left atrium has to come back to left ventricle during diastolic phase. This leads to mid diastolic murmur .Choice A is Correct. Due to early A2, wide Split S2 is heard. Choice B is correct The most characteristic auscultatory finding is grade 3/6 pansystolic murmur. Choice C is correct. Narrow split S1 is a feature of mitral Stenosis.', 'role': 'assistant'}]