A 54-year-old woman presents with a pansystolic murmur along the lower left sternal border radiating rightward to the midclavicular line. The murmur is medium pitched, has a blowing quality, and increases slightly on inspiration. An S3 is audible along the lower left sternal border. Jugular venous pressure is elevated, and a prominent "v" wave is visible. Which of the following is the most likely etiology of the S3?
A. Aortic stenosis
B. Mitral regurgitation
C. Pulmonic stenosis
D. Tricuspid regurgitation
E. Volume overloaded left ventricle
F. Volume overloaded right ventricle
A. Aortic stenosis
B. Mitral regurgitation
C. Pulmonic stenosis
D. Tricuspid regurgitation
E. Volume overloaded left ventricle
F. Volume overloaded right ventricle