Which of the following was widely used for the first time during World War II?

Which of the following was widely used for the first time during World War II?

A Tanks
B Penicillin
C Gas masks

While penicillin was discovered by the Scottish scientist Alexander Fleming in 1928, it would be 12 years before it was ready to be widely used. It was not mass-manufactured until the 1940s, accelerated by World War II, and was used to treat infections in wounded and sick soldiers. Other WWII innovations include radar, computers, and flu vaccines.

The correct answer is Penicillin.