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.
Q: Question: It is under the control of the hypothalamic-pituitary axis the secretion of: 
 Options:  <0> Cortisol <1> Insulin. <2> Calcitonin <3> Glucagon. <4> Parathormone.
A: 
biology