Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Ryu Yoon-ji -  Ryu Yoon-Ji (also Ryu Yun-Ji Korean: 류 윤지; born December 22 1985) is a South Korean swimmer who specialized in sprint freestyle events.
A:
Athlete