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.
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Question: Question: What are the leaders of the Structural / Strategic School of Systemic Therapy? 
 Options:  <0> O'Hanlon and Weiner-Davis. <1> Haley and Minuchin. <2> Weakland and Fisch. <3> Keeney and Ross. <4> Stierlin and Weber.

Answer: psychology


Question: Question: The content validity of an evaluation instrument refers to: 
 Options:  <0> The evidence obtained by factor analysis. <1> The concurrence of measures. <2> The adequacy in the establishment of inferences. <3> The relevance and representativeness of its items. <4> The significant relationships with other measures.

Answer: psychology


Question: Question: When you assess a patient with a neurological problem, you check that he has a positive Kerning sign. This finding is related to: 
 Options:  <0> Meningeal irritation <1> Convulsive crisis. <2> Alteration of the I Cranial Pair. <3> Diplopia. <4> Cerebral stroke.

Answer:
nursery