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: With what aspect does the difficulty of the elderly relate to solve new problems ?: 
 Options:  <0> Creativity. <1> Motivation. <2> Verbal fluency. <3> Memory. <4> Response time.
[EX A]: nursery

[EX Q]: Question: In the presence of a patient with suspected blistering pemphigoid, which of the following tests should we perform to confirm the diagnosis? 
 Options:  <0> Dermatoscopy. <1> Cultivation of the contents of a blister. <2> Skin biopsy for culture. <3> Skin biopsy for histological study and direct immunofluorescence. <4> Analytical with determination of antinuclear and anti DNA antibodies.
[EX A]: medicine

[EX Q]: Question: The arginosuccinasa: 
 Options:  <0> In an enzyme of the citric acid cycle. <1> Converts arginine to lysine. <2> It is activated by the allosteric effector N-acetylglutamate. <3> It produces fumarate. <4> It is a glycogenic amino acid.
[EX A]:
chemistry