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: Why is chlorophyll green ?: 
 Options:  <0> Absorbs all wavelengths of the visible spectrum. <1> Absorbs wavelengths only from the red and ultra-red parts of the spectrum (680nm, 700nm). <2> Absorbs wavelengths in the red and blue parts of the visible spectrum. <3> Absorbs wavelengths only from the blue part of the visible spectrum. <4> Absorbs in the near ultraviolet.

Answer: chemistry


Question: Question: A child must be taught to be more autonomous and learn to eat without help. If he first learns to hold a spoon, then to grab some puree and is finally able to take it to his mouth, and the parents congratulate him, it means that they have used positive reinforcement and the technique of successive approximations. This technique is also called: 
 Options:  <0> Learning by observation. <1> Molding <2> Vicarial learning. <3> Reward. <4> Training with emission.

Answer:
nursery