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: What parasomnia is most common in childhood ?: 
 Options:  <0> Night terrors. <1> Nightmares. <2> REM sleep behavior disorder. <3> Restless legs syndrome. <4> Somnambulism.
[EX A]: psychology

[EX Q]: Question: The papillary muscles: 
 Options:  <0> They contract atrio-ventricular valves. <1> They prevent the reflux of blood to the atria. <2> They avoid the eversion of the semilunar valves. <3> They form the interventricular septum. <4> They are formed by visceral smooth muscle.
[EX A]: biology

[EX Q]: Question: It allows to compare proportions of two independent samples the statistical test: 
 Options:  <0> From McNemar. <1> Of Snedecor. <2> Of the median. <3> Exact Fisher. <4> U of Mann-Whitney.
[EX A]:
biology