Jin is a world-renowned toxicologist. He is sometimes called in to zoos, wildlife refuges, and other facilities to help when an animal is sick. For which situation would Jin MOST likely be asked to consult?

A.
an aviary has an outbreak of polyomavirus among their macaws

B.
a herd of wild buffalo began to exhibit vomiting after spending time in a valley

C.
a circus has an elephant that is nearing the end of a difficult pregnancy

D.
a city zoo has an 89-year-old tortoise that shows signs of gout