Final answer:
Saline is not used during a transurethral prostatectomy because it is a conductive solution that can interfere with electrocautery tools. Instead, non-conductive fluids like glycine, sorbitol, and mannitol are used for patient safety.
Step-by-step explanation:
The solution that is NOT used during a transurethral prostatectomy is saline. During this procedure, non-conductive fluids like glycine, sorbitol, and mannitol are typically used for irrigation, because they do not carry electrical current. This ensures that the electrocautery tools used to resect prostate tissue operate safely without risk of electrical complications to the patient. Saline, being a conductive solution due to its salt content, is not used because it could lead to electrical disturbances during the surgery.