The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 70-year-old man with chronic heart failure presents to the emergency department due to difficulty in breathing. The patient is a known hypertensive for 20 years maintained on amlodipine and telmisartan. The physician notes that he is also being given a diuretic that blocks the Na+ channels in the cortical collecting tubule. Which drug is being referred to in this case?   (A) Furosemide   (B) Hydrochlorothiazide   (C) Triamterene   (D) Acetazolamide
['(C) Triamterene <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Furosemide \n (B) Hydrochlorothiazide \n (C) Triamterene \n (D) Acetazolamide <> possible answers', '  A 70-year-old man with chronic heart failure presents to the emergency department due to difficulty in breathing. The patient is a known hypertensive for 20 years maintained on amlodipine and telmisartan. The physician notes that he is also being given a diuretic that blocks the Na+ channels in the cortical collecting tubule. Which drug is being referred to in this case? <> context@']