Which famous 20th century author worked as a copywriter for Guinness beer and created the slogan 'Guinness is good for you' before achieving literary fame?

Throughout history, renowned authors have occasionally lent their names and creative talents to product endorsements and advertising campaigns. These collaborations between literature and commerce have produced some fascinating and sometimes unexpected partnerships. This trivia question explores a notable case where a celebrated author's connection with a product became part of advertising history. Test your knowledge of these literary commercial crossovers!

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Dorothy Parker
Ernest Hemingway
Dorothy L. Sayers
F. Scott Fitzgerald