Detailed 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.
Q: Question: The negative feedback regulation of thyroid hormone is as follows:
Options: <0> High concentrations of circulating free T3 and T4 that elevate HRT. <1> High concentrations of circulating free T3 and T4 that raise TSH. <2> High concentrations of circulating free T3 and T4 that decrease TRH. <3> Decreased TRH that elevates TSH. <4> Decreased TSH that elevates HRT.
A:
nursery