You are answering a USMLE-style medical question. Question: An 80-year-old African American man is brought to the emergency department in a confused state with history of general illness for the past week. He is known to be hypertensive, but noncompliant with medications for the last 20 years. Physical examination reveals dry skin, ecchymoses, and conjunctival pallor. His blood pressure is 180/99 mm Hg, heart rate is 89/min, and respiratory rate is 17/min. The initial laboratory results are remarkable for hemoglobin of 10 g/dL, mean corpuscular volume of 90 μm3, platelet count of 200,000/mm3, blood urea nitrogen of 29 mg/dL, and creatinine of 2.1 mg/dL. Which of the following would be the best initial management for this patient's condition? Options: A) Angiotensin-converting-enzyme inhibitor (ACEI) B) Angiotensin II receptor blocker (ARB) C) Calcium channel blocker (CCB) D) Thiazide Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.