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: Atenolol is an antihypertensive β-antagonist that belongs to the structural family: 
 Options:  <0> Arylethanolamines <1> Quinazolines <2> β-Haloalkylamines. <3> Aryloxypropanolamines. <4> 2-Imidazolines.
[A]: pharmacology


[Q]: Question: Which glands are located between the skin and the masseter muscle, in front and under the outer ear? 
 Options:  <0> Parotid glands <1> Submandibular glands <2> Sublingual glands <3> Mouth glands <4> Lieberkühn's glands.
[A]: pharmacology


[Q]: Question: Granular or juxtaglomerular cells of the nephron secrete: 
 Options:  <0> Angiotensin I. <1> Renina <2> Angiotensinogen. <3> Aldosterone <4> Vasopressin
[A]:
nursery