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
****
Q: Question: The ribosomal subunits are formed in the: 
 Options:  <0> Nucleoplasm. <1> Nucleolus <2> Nuclear sheet. <3> Nuclear pore. <4> Cytoplasm.

A: biology
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Q: Question: Oxidative phosphorylation involves: 
 Options:  <0> The oxidation of H2O to form O2. <1> Oxidation of O2 to form H2O. <2> The reduction of H2O to give O2. <3> The reduction of O2 to give H2O. <4> None of the above.

A:
chemistry
****