Which pairing correctly matches a scientist with a key discovery?

• A. Louis Pasteur — Vaccination against anthrax
• B. Antonie van Leeuwenhoek — Discovery of anaerobic bacteria
• C. Louis Pasteur — Pasteurization
• D. Joseph Lister — Embryology studies

Answer: (C)

The concept being tested is pairing a scientist with a defining discovery they’re best known for. Louis Pasteur is famous for pasteurization, the process of heating liquids to destroy pathogens while preserving quality. This breakthrough dramatically improved food safety and laid the groundwork for understanding how microbes cause spoilage and disease. While Pasteur also contributed to vaccines (including those for anthrax and rabies), the iconic and defining discovery most closely tied to his name is pasteurization, which is why that pairing is the best match.

Antonie van Leeuwenhoek did pioneering work with early microscopes and described microorganisms, but he is not credited specifically with discovering anaerobic bacteria. Joseph Lister is renowned for developing antiseptic techniques in surgery, not embryology. Therefore, the pairing that best fits a key, well-known discovery is Louis Pasteur with pasteurization.