An 86-year-old retired physician is admitted to the hospital for confusion. He has been incontinent of urine and a urine sample has not been collected yet.

An 86-year-old retired physician is admitted to the hospital for confusion. He has been incontinent of urine and a urine sample has not been collected yet. His vital signs indicate that he is afebrile with a temperature of 36.5°C, but he is hypertensive with BP 168/74. He has a distended abdomen and suprapubic tenderness. A rectal exam reveals empty rectum and normal anal sphincter tone. Which of the following findings would most likely yield a definitive diagnosis? Bladder scan for 200 cc; large, smooth prostate. Bladder scan for 200 cc; normal prostate. Bladder scan for 500 cc; large, smooth prostate. Bladder scan for 500 cc; normal prostate. Bladder scan for 200 cc; absent prostate.