instruction:
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.
question:
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.
answer:
pharmacology


question:
Question: Glycolysis and hepatic gluconeogenesis are regulated reciprocally by facilitated hormonal mechanisms, in addition to an important metabolite that determines whether glucose should be synthesized or degraded. Which?: 
 Options:  <0> Fructose 6-phosphate. <1> Fructose 1,6-bisphosphate. <2> Fructose 2,6-bisphosphate. <3> Pyruvate. <4> Lactate
answer:
chemistry


question:
Question: Free samples of industrially manufactured medicines are considered exceptional publicity; as such, they will only be delivered during a maximum time of: 
 Options:  <0> One year from the date of authorization of the medication. <1> Five years from the date of authorization of the medication. <2> Six months from the date of authorization of the medication. <3> Two years from the date of authorization of the medication. <4> One month from the date of authorization of the medication.
answer:

pharmacology