Instructions: 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.
Input: Question: GH secretion:
Options: <0> It stops after puberty. <1> Increase during the fast. <2> It decreases during sleep. <3> It is stimulated by somatostatin. <4> It is inhibited by exercise.
Output:
biology