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: Epidemiology allows early detection of changes in the incidence of a certain disease in the population. For this, the most correct thing is to use:
Options: <0> The etiological investigation. <1> The description of the natural history of the disease. <2> Epidemiological surveillance. <3> The evaluation of the functioning of the services. <4> None of the previous answers is correct.

A: nursery
****
Q: 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.

A: pharmacology
****
Q: Question: Synovial fluid from patients with gout often contains:
Options: <0> Hippuric acid crystals. <1> Tyrosine crystals. <2> Triple phosphate crystals. <3> Urate crystals. <4> Calcium oxalate crystals.

A:
pharmacology
****