Please answer the following question: Challenge to Lassie - Challenge to Lassie is an American drama directed by Richard Thorpe and released October 31 1949 by MGM Studios. It was the fifth feature film starring the original Lassie a collie named Pal and the fourth and final Lassie film that Donald Crisp would star in.The movie is based on Eleanor Stackhouse Atkinson's book Greyfriars Bobby which in turn is based on a true story. 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