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: They produce myelin in the central nervous system: 
 Options:  <0> Astrocytes <1> Ependymal cells. <2> Satellite cells. <3> Schwann cells. <4> Oligodendrocytes
answer:
biology


question:
Question: The negative feedback regulation of thyroid hormone is as follows: 
 Options:  <0> High concentrations of circulating free T3 and T4 that elevate HRT. <1> High concentrations of circulating free T3 and T4 that raise TSH. <2> High concentrations of circulating free T3 and T4 that decrease TRH. <3> Decreased TRH that elevates TSH. <4> Decreased TSH that elevates HRT.
answer:
nursery


question:
Question: When a person remains in an immobile attitude, with rigid muscles, and can be placed in different positions without him trying to recover the original position for a while, he is likely to suffer: 
 Options:  <0> Passive negativity <1> Automatic obedience. <2> Reactive mannerisms. <3> Psychomotor alteration of rest. <4> Waxy flexibility.
answer:

psychology