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.

[EX Q]: Question: The thromboxanes: 
 Options:  <0> They induce platelet aggregation. <1> They inhibit platelet aggregation. <2> They act as bronchodilators in the respiratory system. <3> They are produced in the membranes of all cells. <4> They are derived from saturated fatty acids.
[EX A]: chemistry

[EX Q]: Question: The lithium dialkyl-heptarate reacts with alkyl halides to produce, by formation of carbon-carbon bonds between the alkyl group of the halide and the alkyl group of the dialkyl acetate: 
 Options:  <0> Alcanes. <1> Alquenos <2> Alquinos. <3> Aromatics <4> Piranos.
[EX A]: chemistry

[EX Q]: Question: In eukaryotes, group II introns are in genes: 
 Options:  <0> Of rRNA. <1> From tRNA. <2> They encode proteins in the nucleus. <3> They encode proteins in mitochondria. <4> None is correct.
[EX A]:
biology