$A$ molecule that binds to a receptor and induces post-receptor events in a cell is called ...$A$... and a molecule that binds to the receptor and inhibits all post-receptor events is called ...$B$....
- A$A$-antagonist,$B$-agonist
- B$A$-agonist,$B$-enzyme
- C$A$-antagonist,$B$-hormone
- D$A$-agonist,$B$-antagonist
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