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 the receptor-mediated endocytosis intervenes: 
 Options:  <0> Only the clathrin. <1> Only the adaptin. <2> Adaptine and clathrin. <3> Chaperones <4> Only the proteins of the membrane.
Example Output: biology

Example Input: Question: A potential receiver: 
 Options:  <0> It is produced by the opening of voltage-dependent channels. <1> Increase its frequency if the intensity of the stimulus increases. <2> It occurs after the binding of the neurotransmitter to the postsynaptic receptor. <3> They occur if the trigger threshold is exceeded. <4> It can be exciter or inhibitor.
Example Output: biology

Example Input: Question: A study is being conducted in a health center to determine the effect of exposure to tobacco smoke in children of smoking parents. For this purpose, a group of healthy children between 3 and 7 years old whose parents are smokers is selected and at the same time an equal number of children whose parents are non-smokers are selected in the same center. A year later, the appearance of respiratory diseases during that year will be investigated in both groups. Indicate the correct answer: 
 Options:  <0> The study design is a prospective cohort. <1> The study design is cases and controls. <2> The study design follows a qualitative methodology. <3> The study is experimental. <4> The type of design used is efficient to study rare diseases.
Example Output:
medicine