<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 67-year-old man with type 2 diabetes mellitus comes to the emergency department because of lightheadedness over the past 2 hours. He reports that he has had similar episodes of lightheadedness and palpitations over the past 3 days. His only medication is metformin. His pulse is 110min and irregularly irregular. An ECG shows a variable R-R interval and absence of P waves. The patient undergoes transesophageal echocardiography. During the procedure, the tip of the ultrasound probe is angled posteriorly within the esophagus. This view is most helpful for evaluating which of the following conditions?? A: Thrombus in the left pulmonary artery, B: Myxoma in the left atrium, C: Aneurysm of the descending aorta, D: Thrombus in the left ventricular apex, E: Tumor in the right main bronchus,  <response>: This is a clinical vignette about a 67-year-old man with type 2 diabetes presenting with lightheadedness, palpitations, tachycardia, and irregularly irregular pulse. ECG shows absence of P waves suggestive of atrial fibrillation. The patient undergoes transesophageal echocardiography TEE to evaluate for possible causes. The question asks which condition is best evaluated by posterior angulation of the TEE probe in the esophagus. Posterior angulation allows visualization of the descending aorta. Therefore, an aneurysm of the descending aorta would be best evaluated with this view.Choices A, B, D are incorrect because thrombus in pulmonary artery, left atrial myxoma, and LV thrombus are better seen with different TEE views. Choice C is incorrect because a bronchial tumor would not be visualized well on TEE.C: Aneurysm of the descending aorta 