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.

Input: Consider Input: 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.

Output: chemistry


Input: Consider Input: Question: When in a laboratory report we observed that the patient presents an increase in the concentration of transferrin with a decrease in its saturation, we can think of: 
 Options:  <0> Pernicious anemia. <1> Sickle-cell anaemia. <2> Thalassemia major. <3> Hereditary spherocytosis. <4> Anemia due to iron deficiency.

Output: pharmacology


Input: Consider Input: Question: The 2,4-diaminopteridine systems, such as aminopterin or methotrexate, are good antitumor agents since they reduce the biosynthesis of purines and pyrimidines by inhibiting the enzyme: 
 Options:  <0> Timidylate synthetase <1> Aromatase <2> Topoisomerase <3> Reverse transcriptase <4> Dihydrofolate reductase.


Output: pharmacology