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.
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Question: 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.

Answer: chemistry


Question: Question: The minimum amount of auditory stimulation needed to begin to identify the lyrics of a song is a threshold: 
 Options:  <0> Absolute. <1> Subliminal. <2> Differential. <3> Relative. <4> Musical.

Answer: psychology


Question: Question: The pH that provides a 0.01 M solution of benzoic acid (pKa = 4.2) is: 
 Options:  <0> 1.1. <1> 2.1. <2> 3.1. <3> 4.1. <4> 4.2.

Answer:
chemistry