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The correct answer to the question is:
D. antidote
Explanation:
1. An antidote is a substance that can counteract the effects of a toxic substance or drug.
2. In the context of the question, a drug used to counteract the effect of an excessive drug toxicity level refers to an antidote.
3. Antidotes are specifically designed to neutralize or reverse the effects of a particular drug or toxin in the body.
4. For example, naloxone is an antidote used to counteract opioid overdose by reversing the depression of the central nervous system caused by opioids.
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