Which scientific product overcame initial public skepticism through the famous 1920s advertising campaign featuring testimonials from 'scientists and physicians' claiming it could kill 'germs that cause disease'?

Throughout history, scientific breakthroughs have sometimes struggled to gain public acceptance or understanding. Advertising campaigns have played a crucial role in bridging this gap, transforming scientific innovations from laboratory curiosities to household essentials. This poll tests your knowledge of a groundbreaking advertising campaign that fundamentally shifted public perception of a scientific product that we now take for granted.

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Listerine mouthwash
X-ray machines
Penicillin antibiotics
Pasteurized milk