Skinny lion and tiger at BJ Zoo

Photos of a gaunt and skinny tiger and lion at the Beijing Zoo have caused a stir online, but zoo officials insist the animals suffer from genetic defects. The photos, posted by a zoo visitor on social media on Monday, showed a skeletal, hunchbacked lion with dull, patchy fur and a white tiger in a similar condition. Officials said that they will pay closer attention to the diets of their big cats.

What kind of diseases did the zoo officials insist the animals suffer from?

A. Genetic defects

B. Depression

C. Indigestion