Task: Question Answering
Input (English): 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.
Output (English): 2