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: Among other properties with respect to hypericin we can indicate:
Options: <0> It is a powerful hepatoprotector extracted from the roots of Hypericum perforatum. <1> It is a powerful cholagogue that is extracted from the resin of the Hypericum perforatum rhizome. <2> It is a removable antiretroviral of the aerial parts of Hypericum perforatum. <3> It is a laxative that is extracted from the leaves of Hypericum perforatum. <4> It is a potent hepatoprotective present in the fruits of Hypericum perforatum.
[EX A]: pharmacology

[EX Q]: Question: The cells of the stomach that are responsible for the secretion of hydrochloric acid are:
Options: <0> The main cells. <1> The G cells <2> The parietal cells. <3> The enterocytes. <4> The mucosites of surface.
[EX A]: nursery

[EX Q]: Question: It is activated when cyclic AMP joins the:
Options: <0> Adenylate cyclase. <1> Protein kinase A. <2> Glycogen phosphorylase kinase. <3> Pyruvate kinase. <4> Phosphofruct kinase 1.
[EX A]:
biology