Definition: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Input: Question: The sedation and drowsiness that mirtazapine produces are directly related to its interaction with the receptors: 
 Options:  <0> 5-HT1. <1> Adrenergic 1 and 2. <2> Histaminergic H1. <3> GABA <4> Muscarinic cholinergic
Output:
pharmacology