instruction:
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.
question:
Question: Kinesin and dynein are: 
 Options:  <0> Adhesion proteins. <1> Microtubular motors. <2> Degradative enzymes <3> Components of the vesicular cover. <4> Transcriptional factors.
answer:
biology


question:
Question: What do you usually associate with the cataplexy characteristic of narcolepsy? 
 Options:  <0> With sleep paralysis. <1> With intense emotions. <2> With hypnagogic and hypnopompic hallucinations. <3> With daytime sleepiness. <4> With irregular schedules.
answer:
psychology


question:
Question: By heating in electric furnaces of silica, calcium carbide and coal, calcium silicides are obtained. One of them: 
 Options:  <0> It has the composition CaSi2. <1> It does not react with water. <2> Does not react with sulfuric acid. <3> It is a powerful oxidizing agent. <4> Its reaction with liquid water generates calcium silicate.
answer:

chemistry