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.
Problem:Question: Hyponatremia is part of the clinical picture of: 
 Options:  <0> Addison's disease <1> Central diabetes insipidus. <2> Nephrogenic insipid diabetes. <3> Mellitus diabetes. <4> Febrile states.
Solution:
pharmacology