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.

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


[Q]: Question: Regarding the stability of the drugs of a proteinaceous nature of biotechnological drugs, we can say: 
 Options:  <0> Which is strongly dependent on pH. <1> That is little affected by ionic strength. <2> That being generally so high does not usually give problems in the formulation. <3> That its maximum value occurs at the pH value of lower solubility. <4> That has a slight dependence on the temperature.
[A]: pharmacology


[Q]: Question: When assessing the position held by the baby suckling, which of the following signs indicate that the position and grip of the baby is NOT correct? 
 Options:  <0> The chin touches the chest. <1> The mouth is very open. <2> Everted lips <3> Nose very close to the chest. <4> More areola visible above the mouth.
[A]:
nursery