The discovery of penicillin by Alexander Fleming in 1928 was a _______ moment in the history of medicine, as it introduced the first true antibiotic and revolutionized the treatment of bacterial infections.
Which choice completes the text with the most logical and precise word or phrase?
pivotal
trivial
confusing
predictable
Correct Answer: A
Choice A is the best answer. The text states the discovery "revolutionized" treatment and was a first. This describes a turning point. "Pivotal" means of crucial importance in relation to the development or success of something.
Choice B is incorrect because "trivial" means unimportant. Choice C is incorrect because "confusing" contradicts the clear advancement described. Choice D is incorrect because "predictable" implies it was expected, which isn't the main point of its revolutionary impact.