instruction:
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.
question:
Question: About free radicals: 
 Options:  <0> They are compounds that contain two or three unpaired electrons in an outer orbital. <1> Reactive oxygen species (ROS) in the cell are only generated enzymatically. <2> Hydrogen peroxide is the most damaging radical in the cell. <3> The hydroxyl radical originates non-enzymatically (Heber-Weiss reaction) and damages proteins and DNA. <4> Oxygen is a triradical.
answer:
chemistry


question:
Question: Reactions in which there are no intermediates are described as: 
 Options:  <0> Concerted. <1> Polar <2> Radicals <3> Homolitic <4> Heterolithic
answer:
chemistry


question:
Question: A 30-year-old woman who came to the emergency room due to loss of vision, pain, red eye and photophobia of OI of 5 days of evolution. In the differential diagnosis you must include all these pathologies EXCEPT one: 
 Options:  <0> Anterior uveitis. <1> Corneal ulcer. <2> Traumatic iritis <3> Sclerouveitis. <4> Serous central chorioretinopathy.
answer:

medicine