One word substitution: a medicine that counteracts a poison.

  • A. antibiotic
  • B. antidote
  • C. antiseptic
  • D. analgesic

Explanation

An antidote reverses the effect of a poison, while an antibiotic kills bacteria, an antiseptic prevents infection on a surface and an analgesic relieves pain. All four share the sense of acting against, but only one names the remedy for poisoning. Medical vocabulary of this kind is common in MDCAT papers.

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