Beta Blockers USMLE Step 1 Practice Question

A 58-year-old man develops suprapubic discomfort and inability to void 12 hours after undergoing elective inguinal hernia repair under general anesthesia. He has no prior history of prostate disease, urinary tract infections, or lower urinary tract symptoms. His vital signs are notable for a blood pressure of 138/86 mmHg, heart rate of 82 beats per minute, and temperature of 37.1°C. Physical examination reveals a palpable, tender, midline suprapubic mass consistent with a distended bladder, and percussion demonstrates dullness over the lower abdomen. Urinalysis is unremarkable. Bedside bladder ultrasound confirms 600 mL of retained urine. A medication is administered that directly stimulates muscarinic receptors to increase detrusor muscle contraction and facilitate micturition. Which of the following was most likely administered?