You are answering a USMLE-style medical question. Question: A 45-year-old male with a history of diabetes and poorly controlled hypertension presents to his primary care physician for an annual check-up. He reports that he feels well and has no complaints. He takes enalapril and metformin. His temperature is 98.8°F (37.1°C), blood pressure is 155/90 mmHg, pulse is 80/min, and respirations are 16/min. His physician adds another anti-hypertensive medication to the patient’s regimen. One month later, the patient returns to the physician complaining of new onset lower extremity swelling. Which of the following medications was likely prescribed to this patient? Options: A) Metoprolol B) Verapamil C) Nifedipine D) Hydrochlorthiazide Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.