Please answer the following question: Four Flies on Grey Velvet (Italian: 4 mosche di velluto grigio) is a 1971 Italian giallo film written and directed by Dario Argento. The film is the third in director Argento's Animal Trilogy which started with The Bird with the Crystal Plumage and The Cat o' Nine Tails. 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?
Answer:
Film