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: The sedation and drowsiness that mirtazapine produces are directly related to its interaction with the receptors: 
 Options:  <1> 5-HT1. <2> Adrenergic 1 and 2. <3> Histaminergic H1. <4> GABA <5> Muscarinic cholinergic
