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: A coulometric evaluation: 
 Options:  <0> You do not need the current performance to be 100%. <1> It does not need an indicator system of the end point. <2> Always use a potentiostatic system. <3> It uses a titrant that is generated electrolytically. <4> You need a burette to add the titrant.
Example Output: chemistry

Example Input: Question: To control the expression of certain genes according to population density, bacteria use systems of: 
 Options:  <0> Strict response <1> Two components <2> Perception of the quorum. <3> Densitometric adaptation. <4> Negative activation
Example Output: biology

Example Input: Question: Under the name of xanthines are grouped: 
 Options:  <0> The coca leaf, cocaine and crack. <1> Methadone and heroin <2> The MDA and the MDMA. <3> Nicotine and inhalants. <4> Caffeine and theophylline.
Example Output:
psychology