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': 'Mid diastolic murmur with presystolic accentuation is typically seen in \nSelect and explain. \nA. Mitral stenosis, B. Mitral regurgitation, C. Aoic stenosis, D. MVP', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 19 th ed pg 1540 In patients with sinus rhythm, the murmur often reappears or becomes louder during atrial systole (presystolic accentuation). Soft, grade I or II/VI systolic murmurs are commonly heard at the apex or along the left sternal border in patients with pure MS', 'role': 'assistant'}]