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: Cyclopentadiene is so reactive that leaving it at room temperature slowly dimerizes by a reaction of: 
 Options:  <0> Friedel-Crafts. <1> Diels-Alder. <2> Markovnikov. <3> Suzuki <4> Gabriel.

Output: chemistry


Input: Consider Input: Question: The reactions in which the kinetics does not depend on the nucleophilic concentration, are reactions: 
 Options:  <0> Radicals <1> SN1. <2> Pericyclic. <3> SN2. <4> None of the above.

Output: chemistry


Input: Consider Input: Question: In the absence of oxygen, the mitochondrial citric acid cycle is inhibited because: 
 Options:  <0> Increases the concentration of ADP, an inhibitor of isocitrate dehydrogenase. <1> The phosphorylations at the substrate level can not be produced. <2> No pyruvate available. <3> ATP synthase is inhibited. <4> The necessary coenzymes can not be reoxidized.


Output: biology