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: A rat pathogen that has fleas as vectors of transmission to humans is: 
 Options:  <0> Rickettsia rickettsii. <1> Yersinia pestis <2> Borrelia burgdorferi. <3> Ehrlichia ewingii. <4> Brucella abortus.
Example Output: biology

Example Input: Question: In phase II of the diet due to acute gastroenteritis, what food should be avoided ?: 
 Options:  <0> Potato. <1> Toasted bread. <2> Grape. <3> Quince. <4> Semolina.
Example Output: nursery

Example Input: Question: During ventricular systole: 
 Options:  <0> All ventricular blood is expelled. <1> Intraventricular pressure is equal in both ventricles. <2> The ventricular volume begins to decrease from the beginning of the contraction. <3> The atrio-ventricular valves are open. <4> The atria are relaxed.
Example Output:
biology