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 content validity of an evaluation instrument refers to: 
 Options:  <0> The evidence obtained by factor analysis. <1> The concurrence of measures. <2> The adequacy in the establishment of inferences. <3> The relevance and representativeness of its items. <4> The significant relationships with other measures.
[EX A]: psychology

[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: An essential characteristic of plasmids is: 
 Options:  <0> Be able to integrate into the genome of the host cell. <1> Direct the process of bacterial conjugation. <2> Carry genes for antibiotic resistance. <3> Replicate autonomously. <4> Being circular DNA molecules.
[EX A]:
biology