Ureterovaginal fistula should best be treated by:: (A) Ureteroneocystostomy, (B) End-to-end anastomosis through an ureteric catheter, (C) Implantation into colon, (D) Heal conduit
Answer is A. Surgeries for ureteric fistula:

Bladder flap procedure (modified Boari-Ocker-Blad)
Ureteroneocystostomy
Implantation into the bladder
Note: End to end anastomosis may lead to stricture formation.
Colonic transplantation results in recurrent pyelonephritis and hyperchloremic acidosis.