Q. A 40-year-old male patient was admitted yesterday with uncontrolled hypertension. His blood pressure is consistently above 180/110 mm Hg despite treatment with amlodipine, lisinopril, and hydrochlorothiazide. The patient’s past medical history is also significant for hyperlipidemia and chronic headaches. He smokes 1 to 2 packs of cigarettes each day, and does not consume alcohol. On admission, cardiac enzymes were negative, and an electrocardiogram was within normal limits. Staff report the patient did well overnight with no new concerns or complaints. On physical examination today, his blood pressure is 178/105 mm Hg, heart rate 80/min, respiratory rate 18/min, and oxygen saturation is 98 percent on room air. His neck is supple with no masses or JVD appreciated. Chest auscultation demonstrates clear breath sounds bilaterally, and cardiac assessment reveals regular rate and rhythm with no murmurs, rubs, or gallops. His abdomen is soft, non-tender, non-distended, with no organomegaly. A bruit is noted on auscultation over the left lower thoracic and lumbar paravertebral region. No peripheral edema is detected. The patient is scheduled for a cardiac echocardiogram later today, and you also order a renal angiogram (see image). Based on the information you have at this point in time, which of the following medications is the best choice to add to this patient’s regimen?