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.

[EX Q]: Question: What element plays a physiological role in the prevention of gastroesophageal reflux? 
 Options:  <0> Upper esophageal sphincter <1> Angle of His. <2> Hernia of Hiato. <3> Purkinje angle. <4> Pyloric sphincter
[EX A]: pharmacology

[EX Q]: Question: In studies that use meta-analysis for the systematic review of the results of psychotherapies, which is the most used dependent variable? : 
 Options:  <0> The number of depressive symptoms. <1> The size of the effect. <2> The systematized observation of the therapist. <3> The number of patients that has been cured. <4> The expectations of the patient.
[EX A]: psychology

[EX Q]: 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
[EX A]:
pharmacology