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: Which of these species is a free radical? 
 Options:  <0> The molecule NO. <1> The O2 molecule. <2> The N2O molecule. <3> The OH- anion. <4> The ClO- anion.
Example Output: chemistry

Example Input: Question: The anatomical dead space: 
 Options:  <0> It is always greater than the physiological one. <1> Secret surfactants. <2> Includes medium-sized bronchioles. <3> It allows gaseous exchange. <4> Includes the volume of inspiratory reserve.
Example Output: biology

Example Input: Question: The stabilizing effect of the alkyl groups on the adjacent π bonds is explained in terms of: 
 Options:  <0> Isomería. <1> Mesomería. <2> Inductive effect <3> Hyperconjugation. <4> Stereoisomería.
Example Output:
chemistry