Ans. A. Chlohalidone Thiazide diuretics are inexpensive, are generally well tolerated, and are recommended as a first-line therapy in the treatment of hypeension in the elderly population.Thiazide diuretics are as effective as any drug for first-line treatment of hypeension in the elderly population is the Antihypeensive and Lipid-Lowering Treatment to Prevent Hea Attack Trial (ALLHAT) study.Patients who received the diuretic had a lower incidence of CV events (secondary outcomes) compared with the other groups. The diuretic treatment group had lower HF rates compared with the CCB group