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: In a cohort study, the number of new cases of disease per person per unit of time is: 
 Options:  <0> The annual incidence. <1> The cumulative incidence or probability. <2> The prevalence rate <3> The density or incidence rate. <4> The relative risk of developing the disease.
Example Output: medicine

Example Input: Question: What is the purpose of the phthalyl group in phthalisulfatiazole ?: 
 Options:  <0> Improve intestinal absorption. <1> Prevent intestinal absorption. <2> Improve the passage through the blood-brain barrier. <3> Prevent passage through the blood-brain barrier. <4> Increase the affinity towards the therapeutic target of the drug.
Example Output: pharmacology

Example Input: Question: Heterochromatin lacks: 
 Options:  <0> Histone H1. <1> Nucleosomes <2> Exons <3> Transcriptional activity <4> Origins of replication.
Example Output:
biology