Question: Which American actor, screenwriter, director, producer, singer-songwriter and author sang this song from the 1971 movie "Willy Wonka & the Chocolate Factory" that was written by British composers Leslie Bricusse and Anthony Newley?
{'answer': 'Gene Wilder', 'supporting_facts': [['Pure Imagination', 0], ['Pure Imagination', 1], ['Pure Imagination', 2], ['Gene Wilder', 0]]}