Which renowned 20th-century author wrote advertising copy for Guinness beer, coining the famous slogan 'Guinness is good for you'?

The world of literature and advertising has seen some fascinating collaborations over the years. Famous authors have occasionally lent their creative talents to major advertising campaigns, creating memorable slogans and content that blurred the line between literature and marketing. This trivia question explores one such notable collaboration that left its mark on advertising history.

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Dorothy L. Sayers
F. Scott Fitzgerald
Aldous Huxley
James Joyce