Okkie van Greunen (28 November 1933 – 17 May 1987) was a South African modern pentathlete. He competed at the 1956 and 1960 Summer Olympics. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Athlete