Until the Recent Invention of ________, All Foods Contained Live

Question

Until the recent invention of ________, all foods contained live microbes.
A) steam-pressure sterilization
B) irradiation
C) lyophilization
D) freezing
E) refrigeration

Accepted Answer

Steam-pressure sterilization is the process of sterilizing food by heating it under high pressure. This method effectively kills all live microbes present in the food, and was not widely used until the recent past. Therefore, prior to this invention, all foods contained live microbes. Irradiation, lyophilization, freezing, and refrigeration do not necessarily kill all live microbes in food.