Ian Williams (born August 31 1989) is an American football nose tackle for the San Francisco 49ers of the National Football League (NFL). He was signed by the 49ers as an undrafted free agent in 2011. He played college football at Notre Dame. 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?
The answer to this question is:
Athlete