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: The chemistry of diazonium salts provides the main synthetic method for preparing aryl fluorides by a process called: 
 Options:  <0> Reorganization of Claisen. <1> Gabriel's reaction. <2> Diazotization reaction. <3> Sandmeyer reaction. <4> Schiemann reaction.
[EX A]: chemistry

[EX Q]: Question: What root predominantly depends on the sensory innervation of the first toe? 
 Options:  <0> L3. <1> L4. <2> L5 <3> S1 <4> L2.
[EX A]: medicine

[EX Q]: Question: The thalamus is part of: 
 Options:  <0> The diencephalon <1> The mesencephalon. <2> The telencephalon. <3> The metencephalon. <4> The bulb.
[EX A]:
pharmacology