In 1985, which company made the disastrous decision to change its flagship product formula, resulting in massive consumer backlash and the eventual return of the original product as 'Classic'?

Throughout business history, even the most successful companies have launched products that failed spectacularly. These product flops have become legendary case studies in marketing and business schools worldwide. This trivia question explores one of the most infamous product launches in corporate history - a moment that cost millions and became a textbook example of how not to introduce a new product to market.

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Coca-Cola (New Coke)
PepsiCo (Crystal Pepsi)
McDonald's (McLean Deluxe)
Apple (Apple Lisa)