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 main vessels that regulate blood flow are: 
 Options:  <0> Arteries <1> Arterioles <2> Capillaries <3> Venules <4> Veins.
[EX A]: biology

[EX Q]: Question: The epithelium of the epidermis is: 
 Options:  <0> Stratified keratinized plane. <1> Stratified non-keratinized plane. <2> Simple keratinized cylindrical. <3> Keratinized stratified cylindrical. <4> Cubic stratified.
[EX A]: biology

[EX Q]: Question: In the prevalence of bioethical principles, the principles of justice and nonmaleficence are framed in an ethics: 
 Options:  <0> Of maximums. <1> Of minimums. <2> Deontological <3> Pluralistic. <4> Of excellence
[EX A]:
nursery