Review Question - QID 214206

A 62-year-old man presents to his primary care physician for a routine visit. He recently retired from his career as a professor. He continues to go on daily walks but has noticed increased shortness of breath and that his pants are fitting tighter. He recently switched shampoos after noticing thinning of his hair. He denies changes in vision and hearing, but notes increased constipation despite no changes in diet. He has a history of persistent atrial fibrillation and bipolar I disorder managed medically. He lives at home with his wife. He does not smoke but does drink socially. His temperature is 98.3°F (36.8°C), blood pressure is 135/80 mmHg, pulse is 72/min, and respirations are 17/min. On exam, his heart rate is regular with a normal rhythm. There are dry crackles at the lung bases bilaterally. His abdomen is mildly distended with epigastric fullness and hypoactive bowel sounds. His deep tendon reflexes show delayed relaxation. His skin is dry with no rashes. A chest CT is performed with the findings in Figure A. Which of the following medications is most likely causing this patient's symptoms?