question: 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 110/min 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'},