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What does "efficacy" refer to?

  1. The capacity to produce an effect

  2. A violation of a law, command, or duty

  3. A violation of a law, command, or duty

  4. Never done or known before

The correct answer is: The capacity to produce an effect

"Efficacy" refers to the capacity to produce an effect. This word specifically relates to how successful or effective something is in achieving a desired outcome. The other options in the question are not related to the meaning of "efficacy".