During stethoscopic examination at the left midclavicular line in the fifth intercostal space, a murmur is heard between the first and second heart sounds. Which listed abnormality could cause it?
The described site is the cardiac apex/mitral listening area. Between S₁ and S₂ is systole. Mitral regurgitation produces a systolic murmur classically heard best at the apex, so B matches both location and timing. Mitral stenosis is chiefly diastolic, as is aortic regurgitation.
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