Final answer:
The most appropriate suture for closure of a ureterotomy is an absorbable suture such as polyglycolic acid (PGA) or polydioxanone (PDS).
Step-by-step explanation:
When closing a ureterotomy, the most appropriate suture would be an absorbable suture that is fine and reliable. A common choice is a monofilament absorbable suture, such as polyglycolic acid (PGA) or polydioxanone (PDS). These sutures provide good tensile strength and are absorbed by the body over time, reducing the risk of long-term complications.