Question: What is the nationality of this novelist, short story writer, poet, screenwriter, and fighter pilot who wrote the novel that inspired the 1971 film "Willy Wonka & the Chocolate Factory?"
Sentence (from "Willy Wonka &amp; the Chocolate Factory"): Dahl was credited with writing the film's screenplay; however, David Seltzer, who went uncredited in the film, was brought in to re-work Dahl's screenplay against his wishes, making major changes to the ending and adding musical numbers.
Relevant evidence: No