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: How are the proteins involved in the DNA curl and compaction called ?: 
 Options:  <0> Kinases <1> Topoisomerases <2> Histones. <3> Phosphatases <4> DNA nucleases
[A]: chemistry


[Q]: Question: Acetylation of histones affects transcription: 
 Options:  <0> Blocking the incorporation of other components of the transcription machinery. <1> Preventing the remodeling of chromatin. <2> Facilitating the action of helicases. <3> Decreasing sensitivity to nuclear receptors. <4> Reducing the affinity of histones for DNA.
[A]: chemistry


[Q]: Question: Of the indicated indications, which of them is authorized for the ACEI? 
 Options:  <0> Angioedema <1> Pulmonary hypertension in neonates. <2> Diabetic nephropathy <3> Benign prostatic hyperplasia. <4> Narrow angle glaucoma.
[A]:
pharmacology