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.

[EX 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.
[EX A]: pharmacology

[EX Q]: Question: The reactivity of various carbonyl groups is determined by their relative stability. The order of reactivity towards nucleophiles is:
Options: <0> Amides> Esters> Ketones> Aldehydes. <1> Aldehydes> Ketones> Esters> Amides. <2> Amides> Ketones> Aldehydes> Esters. <3> Aldehydes> Esters> Ketones> Amides. <4> Amides> Ketones> Esters> Aldehydes.
[EX A]: chemistry

[EX Q]: Question: What is the main cerebral structure involved in conditioned fear ?:
Options: <0> The hippocampus <1> The cingulate cortex. <2> The olfactory bulb. <3> The hypothalamus <4> The amygdala
[EX A]:
psychology