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.

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

[EX Q]: Question: Proton pump inhibitor drugs are useful in the treatment of: 
 Options:  <0> Constipation. <1> Corneal ulcer. <2> Peptic ulcer. <3> Traveler's diarrhea. <4> Crohn's disease.
[EX A]: nursery

[EX Q]: Question: The differential modification of RNA: 
 Options:  <0> It can result in multiple products from one gene. <1> It occurs thanks to the transcription bubble. <2> It is catalyzed by RNA polymerase I. <3> It is catalyzed by RNA polymerase II. <4> It is catalyzed by RNA polymerase III.
[EX A]:
chemistry