4. Which of the following descriptions about receptor binding drugs is incorrect?
(A) a-Bungarotoxin, a kind of snake poison, is an antagonist of GABA receptor.
(B) Caffeine is an antagonist of adenosine receptor.
(C) Ketamine is a NMDA neurotransmitter blocker.
(D) Ondansetron, an antiemetics (止吐藥), is a serotonin receptor agonist.
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