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.

Example Input: Question: COMPLETE: in the Krebs cycle 4 oxidation reactions occur, in 3 of them the final acceptor electron is ___ and in the other is ___: 
 Options:  <0> FAD / FMN. <1> NAD + / FMN. <2> NADP + / FAD. <3> NAD + / FAD. <4> FAD / NAD +.
Example Output: chemistry

Example Input: Question: For which disorder is the technique of fading stimulated frequently used? 
 Options:  <0> Enuresis <1> The selective mutism. <2> Childhood asthma <3> Posttraumatic stress disorder secondary to sexual abuse. <4> The encopresis.
Example Output: psychology

Example Input: Question: They incorporate sterols to their plasma membrane: 
 Options:  <0> Mycobacterium tuberculosis. <1> Micrococcus luteus. <2> Mycoplasma pneumoniae <3> Chlamydia trachomatis. <4> Rickettsia prowazekii.
Example Output:
biology