The correct answer is Alpha-blockers, not Beta-blockers. Alpha-blockers help relax the smooth muscle of the prostate and bladder neck, improving urine flow and thereby preventing recurrent acute urinary retention in BPH patients. Beta-blockers do not have this effect on the urinary tract. Therefore, Alpha-blockers are the first-line pharmacologic treatment to reduce the risk of urinary retention and improve symptoms in BPH.

Reference: Campbell-Walsh Urology, Wein, 12th Edition.