Which renowned 20th century poet wrote the famous advertising slogan "Guinness is good for you" and other early promotional material for the Irish beer brand?

The intersection of literature and advertising has produced some fascinating collaborations. Authors and poets have occasionally lent their talents to create memorable advertising campaigns that transcend commercial purposes to become cultural touchstones. This trivia question explores one such notable crossover between literary genius and brand marketing that changed advertising history.

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W.B. Yeats
Dorothy Parker
Dorothy L. Sayers
T.S. Eliot