A nurse is caring for a group of clients on a medical surgical unit. Which of the following clients is at greatest risk for urinary retention?
1) The client who has a history of liver failure.
2) The client who was treated with antibiotics for a staphylococcal infection of the skin 2 weeks ago.
3) The client who reported eating a diet high in calcium oxalate.
4) The client who had general anesthesia for back surgery 4 hr ago.