Which cereal brand first introduced the concept of 'free toy inside' as a marketing strategy that revolutionized product engagement for children?

The breakfast cereal industry has pioneered some of the most innovative and influential marketing techniques in food retail. From character mascots to prize promotions, cereal brands have created distinctive ways to capture consumer attention in crowded supermarket aisles. This trivia question tests your knowledge of a groundbreaking retail marketing innovation that changed how consumers interact with cereal products.

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Kellogg's Corn Flakes
Cracker Jack (while technically a popcorn snack, it's considered the pioneer that cereal brands later emulated)
Post Grape-Nuts
General Mills Cheerios