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: In a potentiometry at zero intensity the electrode: 
 Options:  <0> Indicator always measures balance potentials. <1> Indicator measures the half-wave potential. <2> Indicator can measure a mixed potential. <3> Reference is always a calomel platinum electrode. <4> Indicator is always a platinum electrode.
[EX A]: chemistry

[EX Q]: Question: By reaction of carbonyls with primary and secondary amine, the following are obtained: 
 Options:  <0> Iminas and oximes. <1> Iminas and enaminas. <2> Oxazones and hydrazones. <3> Semicarbazones and nitrones. <4> None of the above.
[EX A]: chemistry

[EX Q]: Question: Among the exogenous factors that favor the appearance of gout are the drugs. Of the following indicated, which one do you consider that it does NOT favor hyperuricemia? 
 Options:  <0> Acetylsalicylic acid at doses lower than 1g daily. <1> Hydrochlorothiazide <2> Cyclosporin A. <3> Ethambutol <4> Estrogens
[EX A]:
medicine