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: In strict vegetarians, a lack of one of the following vitamins may appear: 
 Options:  <0> B12 vitamin. <1> Vitamin C. <2> Retinol <3> Folate <4> Niacin
[EX A]: nursery

[EX Q]: Question: The content validity of an evaluation instrument refers to: 
 Options:  <0> The evidence obtained by factor analysis. <1> The concurrence of measures. <2> The adequacy in the establishment of inferences. <3> The relevance and representativeness of its items. <4> The significant relationships with other measures.
[EX A]: psychology

[EX Q]: Question: Kinesin and dynein are: 
 Options:  <0> Adhesion proteins. <1> Microtubular motors. <2> Degradative enzymes <3> Components of the vesicular cover. <4> Transcriptional factors.
[EX A]:
biology