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A drug binds a receptor and switches on a response. That drug is an:

AAntidote
BAgonist
CAntigen
DAnticline
Answer & Solution
Correct answer: B. Agonist
1. It attaches to the receptor. 2. It then triggers an effect. 3. So it is an agonist. _Source: OpenStax Pharmacology for Nurses, Chapter 2, Drug Administration and Pharmacokinetics._
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