<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 64-year-old woman with a history of rheumatic fever presents to her primary care clinician complaining of excessive fatigue with walking and difficulty lying flat. She had no prior physical limitations, but recently has been unable to walk more than 3 blocks without needing to stop and rest. Her cardiac exam is notable for a late diastolic murmur heard best at the apex in the left lateral decubitus position with no radiation. What is the most likely diagnosis?? A: Mitral Regurgitation, B: Aortic Stenosis, C: MItral Stenosis, D: Aortic Regurgitation, E: Tricuspid Regurgitation,  <response>: Based on the information provided in the question stem, the key findings are:- 64-year-old woman with history of rheumatic fever - Presenting with excessive fatigue with walking and difficulty lying flat- Recent onset of inability to walk more than 3 blocks without needing to rest- Cardiac exam notable for late diastolic murmur at the apex in left lateral decubitus position, no radiation- History of rheumatic fever is a risk factor for valvular abnormalities - Fatigue and limitation in activity suggests possible valvular stenosis - Late diastolic murmur at the apex in left lateral decubitus position suggests mitral valve pathology- No radiation of murmur makes aortic valve less likelyGiven these findings, the most likely diagnosis is mitral stenosis.C: MItral Stenosis 