Which food company first used the slogan "Breakfast of Champions" in their advertising?

Advertising slogans are powerful tools that food companies use to create memorable brand identities. Some food advertising catchphrases have become so iconic that they're instantly recognizable even decades after their introduction. This trivia tests your knowledge of famous food advertising slogans that have shaped consumer behavior and food culture. Do you know which brand is behind this classic slogan that revolutionized how a common breakfast food was marketed?

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Wheaties
Quaker Oats
Kellogg's Corn Flakes
Post Grape-Nuts