Please answer the following question: Billy Kellock (footballer) - William Billy Kellock (born 7 February 1954) is a Scottish former footballer who scored 77 goals in 298 league games in a 11-year career in the Football League in the 1970s and 1980s. He played for Aston Villa Cardiff City Norwich City Millwall Chelmsford City Kettering Town Peterborough United Luton Town Wolverhampton Wanderers Southend United Port Vale and Halifax Town. 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