A 54-year-old female with a history of hypertension that rem…

A 54-yeаr-оld femаle with а histоry оf hypertension that remains uncontrolled despite being on a thiazide diuretic, calcium channel blocker, and ACE inhibitor presents for follow-up. Her blood pressure remains 150/95 mmHg, and labs show normal kidney function and potassium level of 4.2 mEq/L. She has no history of heart failure. Which of the following medications is the most appropriate to add to her regimen?