Which unexpected brand collaboration resulted in the viral 'Kentucky Fried Chicken & Donuts Sandwich' that sold out nationwide in 2019?

In 2019, a groundbreaking collaboration between two major food brands created a product that took social media by storm. This partnership combined unlikely flavor profiles, resulting in a limited edition item that sold out within days at most locations. Test your knowledge about this famous food industry collaboration that had consumers lining up and resellers marking up prices on secondary markets.

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KFC and Krispy Kreme
KFC and Dunkin'
KFC and Hostess
KFC and Cinnabon