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.

Example Input: 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.
Example Output: biology

Example Input: Question: Relating to topoisomerases: 
 Options:  <0> They are enzymes that convert the D-amino acids into L-amino acids. <1> They are enzymes that synthesize DNA. <2> They are enzymes that participate in the union of the subunits of the ribosome. <3> They are enzymes that denature DNA. <4> DNA gyrase is a special toposiomerase.
Example Output: chemistry

Example Input: 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.
Example Output:
pharmacology