Yao Zhikui (born February 7, 1991) is a Chinese mixed martial artist who competes as a Flyweight for the Ultimate Fighting Championship.
 A professional competitor since 2012, Yao has mostly fought in China.
The flyweight division in mixed martial arts – as defined by the Nevada State Athletic Commission combat sports doctrine and by the Association of Boxing Commissions – groups together all competitors 125 lb (57 kg) and below.

Question: What does Yao Zhikui compete in?
Answer: mixed martial arts