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: Point out the correct statement about the parent training program created by Barkley: 
 Options:  <0> Its main objective is to improve the social and communication skills of children. <1> Its main objective is to improve the children's self-control skills. <2> Prohibits the use of any type of punishment, including time out. <3> One of its objectives is to reduce the conflicts that may arise in the school context. <4> Sessions are held with the children in parallel with those of the parents.
[EX A]: psychology

[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: In a Gram positive pathogen involved in pharyngitis and rheumatic fever: 
 Options:  <0> Staphylococcus aureus. <1> Micrococcus luteus. <2> Moraxella catarrhalis. <3> Haemophilus influenzae. <4> Streptococcus pyogenes.
[EX A]:
biology