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

[Q]: Question: Pseudomonas aeruginosa is:
Options: <0> Able to ferment a large variety of sugars. <1> Often resistant to many antibiotics for medical use. <2> Responsible for toxi-alimentary infections. <3> Part of the normal microbiota of the skin. <4> A commensal bacterium of the digestive tract.
[A]: biology

[Q]: Question: The kidneys secrete the hormone:
Options: <0> Calcitriol. <1> Renina <2> Angiotensin II. <3> Aldosterone <4> Calcitonin
[A]:
biology