Q:A.k.a. Cassius Clay (styled as a.k.a. Cassius Clay) is a 1970 boxing documentary film about the former heavyweight champion Muhammad Ali. Directed by Jimmy Jacobs the film was made during Ali's exile from the sport for refusing to be inducted into the US Army on religious grounds. Narrated by Richard Kiley the film gives an overview of Ali's career to that point. 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:
Film