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: In oxidative stress it is characteristic: 
 Options:  <0> Decrease in the concentration of oxidized glutathione. <1> Increase in the concentration of reduced glutathione. <2> Decreased production of reactive oxygen species. <3> Increase in the production of reactive oxygen species. <4> None of the previous are true.

A: chemistry
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Q: Question: A potential receiver: 
 Options:  <0> It is produced by the opening of voltage-dependent channels. <1> Increase its frequency if the intensity of the stimulus increases. <2> It occurs after the binding of the neurotransmitter to the postsynaptic receptor. <3> They occur if the trigger threshold is exceeded. <4> It can be exciter or inhibitor.

A: biology
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Q: Question: As for the agonizing rattles (pre-mortem rales), it is true that: 
 Options:  <0> It is a situation well tolerated by the family. <1> They originate a silent breathing. <2> They are treated with morphine. <3> They are treated with prokinetics. <4> They are treated with scopolamine.

A:
medicine
****