Please answer the following question: John Gelnar -  John Richard Gelnar (born June 25 1943) is an American former Major League Baseball pitcher.Gelnar attended the University of Oklahoma. He signed with the Pittsburgh Pirates as an amateur free agent in 1963. His contract was purchased by the Kansas City Royals from the Pirates after the 1968 season but he was traded by the Royals with Steve Whitaker to the Seattle Pilots for Lou Piniella prior to the 1969 season. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Athlete