You are answering a USMLE-style medical question. Question: A 50-year-old man comes to the physician because of swelling of his legs for 2 months. Three months ago, he was diagnosed with hypertension and started on a new medication. His blood pressure is 145/95 mm Hg. Physical examination shows 2+ edema in both lower extremities. Laboratory studies are within the reference ranges. This patient was most likely treated with which of the following drugs? Options: A) Losartan B) Spironolactone C) Hydrochlorothiazide D) Amlodipine Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.