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: Glutathione fulfills everything that follows except: 
 Options:  <0> It is a dipeptide. <1> Eliminates peroxides and free radicals. <2> Participates in the detoxification of compounds. <3> Acts as a cofactor of some enzymes. <4> Protects against oxidative stress.
[EX A]: chemistry

[EX Q]: Question: The 2,4-diaminopteridine systems, such as aminopterin or methotrexate, are good antitumor agents since they reduce the biosynthesis of purines and pyrimidines by inhibiting the enzyme: 
 Options:  <0> Timidylate synthetase <1> Aromatase <2> Topoisomerase <3> Reverse transcriptase <4> Dihydrofolate reductase.
[EX A]: pharmacology

[EX Q]: Question: Which of the following nematodes is a large intestine parasite? 
 Options:  <0> Trichuris trichiura. <1> Ancylostoma duodenale. <2> Trichinella spiralis. <3> Necator americanus. <4> Ascaris lumbricoides.
[EX A]:
pharmacology