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.

Q: Question: The valvulopathy that triggers an overload of volume in both the left atrium and ventricle is: 
 Options:  <0> Mitral stenosis. <1> Mitral insufficiency <2> Aortic stenosis. <3> Aortic insufficiency <4> Tricuspid insufficiency.

A: pharmacology
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Q: Question: The biological cycle of Trichinella spiralis is of the following type: 
 Options:  <0> Stenoxene <1> Optional. <2> Triheteroxene <3> Autoheteroxene <4> Heterogónico.

A: pharmacology
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Q: Question: Gas chromatography combined with mass spectrometry (GC-MS) is the most commonly used chromatographic coupled technique. The main difficulty of the coupling is in: 
 Options:  <0> The analysis of molecular ions in the same place where they are generated. <1> The production of highly fragmented ions with accelerated electron generation. <2> The increase in the output flow rate of the chromatograph, which can not exceed nL / min. <3> The obtaining of the bidimensional spectrum that allows the separation in function of the relationship q / r. <4> The introduction into the high vacuum of the mass analyzer, of a compound that is at an atomospheric pressure.

A:
chemistry
****