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: The exergonic reactions of metabolism:
Options: <0> Consume free energy. <1> They are thermodynamically favorable. <2> They are always quick reactions. <3> They do not require the action of enzymes. <4> They have high values of activation energy.
[A]: biology

[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: The integral psychological therapy (IPT) of Brenner et al. (1992) consists of different subprograms. Which of these subprograms does NOT belong to such therapy ?:
Options: <0> Cognitive differentiation <1> Solution of interpersonal problems. <2> Social perception. <3> Social skills. <4> Management and control of stress.
[A]:
psychology