Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Benzodiazepines reduce anxiety because they work as: 
 Options:  <1> Antagonists of GABA receptors. <2> GABA receptor agonists. <3> Antagonist of noradrenergic receptors. <4> Noradrenergic receptor agonist. <5> Antagonists of serotonergic receptors.
