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 presence of nonspecific prodromes in a psychotic disorder: 
 Options:  <0> It refers to one of the three phases in which a psychotic episode evolves. <1> It refers to the acute phase. <2> It refers to the recovery phase. <3> It defines the abrupt onset of the first psychotic episode. <4> It is a phase in which the patient does not need treatment.
[EX A]: nursery

[EX Q]: Question: Histone deacetylases (HDAC) promote: 
 Options:  <0> A less condensed chromatin. <1> A weaker link between histones and DNA in nucleosomes. <2> The acetylation of lysine residues in histones. <3> That the poly (A) tail of the histone messenger RNAs be more extensive. <4> The termination of the transcription and the genetic silencing.
[EX A]: pharmacology

[EX Q]: Question: Which of the following changes is the most potent stimulus for glucagon secretion? 
 Options:  <0> Gastric filling <1> Hyperglycemia <2> Hypernatremia <3> Pass from chyme to duodenum. <4> Hypoglycemia
[EX A]:
pharmacology