18. What is the Austin-Flint murmur?

A. The murmur created by severe aortic stenosis heard at the cardiac apex sounding holosystolic and mimicking mitral regurgitation

B. The systolic ejection murmur from the high flow across the aortic valve in a person with severe aortic insufficiency

C. The short, early diastolic murmur caused by severe aortic regurgitation

D. The diastolic murmur at the cardiac apex in the presence of severe aortic regurgitation caused by the regurgitant jet striking the anterior leaflet of the mitral valve mimicking mitral stenosis