Jasmine attends a class reunion for her veterinary school. Several of her classmates run veterinary practices of their own, one works for the government to oversee livestock health, and one specializes in exotic animals and is now working for a large zoo. Jasmine spends her days in a lab, using different formulas to prevent the growth of microfilariae into larvae. Which field would Jasmine MOST likely tell her classmates that she has specialized in