Choose the option opposite in meaning to the underlined word(s).

The potency of the drug has been acknowledge?

  • A action
  • B loss
  • C inefficacy
  • D power

The correct answer is C. inefficacy

potency is the power of something to influence or make an impression. example "a myth of enormous potency"

synonyms: power · powerfulness · vigour · strength · might · mightiness · force · 

inefficacy failure to produce the desired effect. The condition of being ineffective.

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