Please answer the following question: Duel of Fists - Duel of Fists (Chinese: ; Quan Ji or Kuen gik) is a 1971 Hong Kong martial arts film directed by Chang Cheh and starring David Chiang and Ti Lung. Filmed on location in Bangkok the story concerns a Hong Kong engineer (Chiang) who goes to Thailand to find his long-lost half-brother (Ti Lung) who is a Muay Thai boxer. 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?
A:
Film