While walking through a hospital where fingers are reattached, you notice leeches being used on reattached fingers to improve circulation. you realize that annelids can be used in medicine?

Reconstructive surgeons needing to remove stagnant blood and dead tissues from a flap fingers use annelids such as leech. The leech anesthetize the wound and produce an anticoagulant effect that keep blood from clotting, providing continues blood flow during reattaching of fingers. In addition, leeches also reduce the scarring of wound.

if you listed your answers right then i believe your answer is b.

answer denitrification;