Final answer:
Benign Prostatic Hyperplasia (BPH) can lead to kidney stones or infection by blocking urethral flow, resulting in urine stagnation, which contributes to stone formation and raises the risk of infection.
Step-by-step explanation:
Benign Prostatic Hyperplasia (BPH) can cause kidney stones or infection by blocking urethral flow (Option A). BPH, which is an abnormal growth of the prostate gland, causes constriction of the urethra, which disrupts the normal flow of urine out of the bladder. As a result, urine can back up in the system, leading to an increased risk of kidney stones and urinary tract infections. When the flow of urine is blocked, substances such as calcium, oxalate, and phosphorus can become highly concentrated in the stagnant urine and lead to the formation of kidney stones. Moreover, the incomplete emptying of the bladder can promote bacterial growth, increasing the risk of infection.