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: Mitochondrial oxidative phosphorylation is regulated by:
Options: <0> Mitochondrial steroid hormones. <1> Apoptosis <2> Thermogenin <3> The cytochrome c. <4> The cellular energy charge.
[EX A]: chemistry

[EX Q]: Question: The antiulcer drug called omeprazole has in its structure:
Options: <0> A benzimidazole heterocycle. <1> A thiol group. <2> A pyrazole heterocycle. <3> A dimethylamino group. <4> A thiozolic heterocycle.
[EX A]: pharmacology

[EX Q]: Question: Inhibits gastrin secretion:
Options: <0> Parasympathetic stimulation. <1> Sight, aroma and taste of the food. <2> Stomach distension <3> Presence of proteins in the stomach. <4> Somatostatin.
[EX A]:
biology