What unexpected source provided Alexander Fleming with the discovery of penicillin in 1928?

Throughout history, medical breakthroughs have transformed human health and longevity in profound ways. Some discoveries were the result of years of meticulous research, while others came about through fortunate accidents. This trivia question focuses on a pivotal medical discovery that fundamentally changed how we combat infectious diseases. Test your knowledge about this revolutionary advancement that saved countless lives!

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• A contaminated petri dish with a mold that killed bacteria
• Tree bark samples collected during an expedition to the Amazon rainforest
• Blood samples from World War I soldiers who showed unusual immunity to infections
• A fungus growing on rotting apples in his laboratory's waste bin

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