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: 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.
[A]: pharmacology

[Q]: Question: Which of the following is a more reliable marker of malnutrition in the elderly patient?
Options: <0> Weight loss of 1 kg in the last month. <1> Body mass index greater than 24. <2> Difficulty swallowing, chewing and / or lack of appetite. <3> Albumin 4.5 gr / dl. <4> Mini Nutritional Assessment less than 17.
[A]: medicine

[Q]: Question: What is the therapeutic objective of Covert Sensitization ?:
Options: <0> Develop an attraction response to a stimulus that was previously a source of aversion. <1> Increase the tolerance to an aversive stimulus and reduce the emotional activation it produces. <2> Postpone immediate positive reinforcers of undesirable behaviors. <3> Develop an aversion response to a stimulus that was previously a source of attraction. <4> Mentally reinforce successful trials aimed at achieving objective behavior.
[A]:
psychology