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: Liquid chromatography using linked stationary phases can be divided into normal phase and reverse phase phases. In this context it can be said that: 
 Options:  <0> The main separation mechanism in reverse phase is the distribution, while adsorption also plays a very important role in the normal phase. <1> In normal phase chromatography, a large number of non-polar stationary phases can be used. <2> The main separation mechanism in normal phase is the distribution, while the adsorption plays a very important role in the reverse phase. <3> In reverse phase chromatography, the stationary phase is polar and the non-polar eluents. <4> In reverse phase chromatography, a large number of polar stationary phases can be used.
[A]: chemistry


[Q]: Question: Epidemiology allows early detection of changes in the incidence of a certain disease in the population. For this, the most correct thing is to use: 
 Options:  <0> The etiological investigation. <1> The description of the natural history of the disease. <2> Epidemiological surveillance. <3> The evaluation of the functioning of the services. <4> None of the previous answers is correct.
[A]: nursery


[Q]: Question: It has superficial cells with abundant glycogen: 
 Options:  <0> Language. <1> Esophagus. <2> Thin skin <3> Vagina. <4> Thick skin.
[A]:
biology