Problem: A 60-year-old male patient with a history of hypertension and coronary artery disease presents for a routine new patient examination. The nurse practitioner notes a low-pitched diastolic rumbling murmur with an opening snap at the apex of the heart. The murmur is easily heard with the stethoscope on the chest and there is a palpable thrill. Which of the following best describes the murmur? Need Assignment Help? A. Grade I/IV mitral stenosis B. Grade II/IV aortic stenosis C. Grade III/IV mitral regurgitation D. Grade IV/IV mitral stenosis