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: Regarding gastroesophageal reflux disease, which of the following statements is true? 
 Options:  <0> The intensity and frequency of heartburn has little relationship with the presence and severity of endoscopic esophagitis. <1> Most patients with gastroesophageal reflux disease have esophagitis at endoscopy. <2> Treatment with proton pump inhibitors usually achieves good control of symptoms but is not superior to placebo in the endoscopic cure of esophagitis. <3> Barrett's esophagus can progress to low-grade epithelial dysplasia, high-grade epithelial dysplasia, and finally squamous cell carcinoma of the esophagus. <4> Endoscopic screening and surveillance programs have unequivocally shown to be able to reduce mortality in patients with Barrett's esophagus.
Example Output: medicine

Example Input: Question: The tissue is avascular: 
 Options:  <0> Epithelial. <1> Conjunctive. <2> Osseous. <3> Muscular. <4> Nervous.
Example Output: biology

Example Input: Question: The stimulation of the carotid bodies: 
 Options:  <0> Decreases the pH of arterial blood. <1> PCO2 decreases in arterial blood. <2> Increases the arterial concentration of bicarbonate. <3> Increases the urinary excretion of sodium. <4> Lowers blood pressure
Example Output:
biology