Multiple choice

The discovery of penicillin was a major _____________ in medical science.

  1. adaptation

  2. evolution

  3. breakthrough

  4. exchange
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A "breakthrough" is a significant development or discovery, which perfectly describes the discovery of penicillin. "Adaptation", "evolution", and "exchange" do not fit the context of a major scientific discovery.

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