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: Hypokalemia is a physiological symptom that can typically occur: 
 Options:  <0> In sleep disorders. <1> In addictions. <2> In anorexia nervosa. <3> In bulimia but not in anorexia nervosa. <4> In disorders of attention deficit and disturbing behavior.

A: psychology
****
Q: Question: Raile and Marriner in their studies on the theoretical works in nursing, review different aspects among which are those referred to semantics and structure. This analysis of the concrete theoretical framework refers to: 
 Options:  <0> The simplicity <1> The generality <2> The empirical precision. <3> The deductible consequences. <4> The clarity.

A: nursery
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Q: Question: What is the part of the antigen that is recognized by the antibody called ?: 
 Options:  <0> Ectopic. <1> Epimer. <2> Epithet. <3> Epitope. <4> Endogenous.

A:
chemistry
****