Instructions: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: In oxidative stress it is characteristic:
Options: <1> Decrease in the concentration of oxidized glutathione. <2> Increase in the concentration of reduced glutathione. <3> Decreased production of reactive oxygen species. <4> Increase in the production of reactive oxygen species. <5> None of the previous are true.
Output:
4