Which food industry CEO pioneered the process of adding essential vitamins and minerals to cereals, creating the 'fortified cereal' category we know today?

The breakfast cereal industry has seen numerous innovations over the decades, from manufacturing processes to marketing strategies. One particular breakthrough in the 1940s revolutionized how we consume cereal products today and created an entirely new segment in the market. Test your knowledge about this significant product innovation that changed breakfast tables worldwide!

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Will Keith Kellogg (Kellogg's)
C.W. Post (Post Consumer Brands)
Paul S. Willis (Carnation Company)
Claud S. Sonfield (General Mills)