<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 44-year-old woman comes to the physician because of progressively worsening shortness of breath with exertion and intermittent palpitations over the last 2 months. She has had neither chest pain nor a cough. Her pulse is 124min and irregular. Physical examination shows a grade 46 high-pitched holosystolic murmur that is best heard at the apex and radiates to the back. The murmur increases in intensity when she clenches her hands into fists. The lungs are clear to auscultation. Further evaluation of this patient is most likely to show which of the following findings?? A: Pulmonary artery thrombus on computed tomography scan, B: Diffuse ST elevations on electrocardiogram, C: Obstruction of the right marginal artery on coronary angiogram, D: Reversible area of myocardial ischemia on nuclear stress test, E: Dilation of left atrium on echocardiogram,  <response>: This is a clinical case question involving a 44-year-old woman with shortness of breath, palpitations, and a heart murmur on exam. The key findings are a high-pitched holosystolic murmur that radiates to the back and increases with handgrip, suggesting mitral regurgitation. The irregular pulse indicates possible atrial fibrillation. The choices include testing for pulmonary embolism, ischemia, and structural heart disease. Based on the murmur and symptoms, the most likely finding would be an abnormality on echocardiogram such as mitral valve prolapse or regurgitation causing dilation of the left atrium.E: Dilation of left atrium on echocardiogram 