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 standard free energy of activation of a reaction is:
Options: <0> The difference in free energy between the basal state of the products and the substrates. <1> The difference of the enthalpy minus the entropy of the system. <2> The basal energy of the substrates in a catalyzed reaction. <3> The additional free energy that molecules must reach to reach the state of transition. <4> The energy released from a catalysed reaction.
[EX A]: chemistry

[EX Q]: Question: The binding of an allosteric activator to an allosteric enzyme typically results in:
Options: <0> Decrease the Vmax. <1> The transition to a less soluble state. <2> Decrease the Km by its substrate. <3> The transition to hyperbolic kinetics. <4> The dissociation of its subunits.
[EX A]: chemistry

[EX Q]: Question: What is the approach proposed by the relationship model between therapist and client as expert to expert ?:
Options: <0> The behavioral model. <1> The constructivist perspective <2> The psychoanalysis. <3> The strategic school. <4> The therapy centered on the client.
[EX A]:
psychology