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: Esters can be obtained from carboxylic acids and alcohols, by applying the Fischer esterification reaction in which: 
 Options:  <0> A base is used as a catalyst. <1> A ketone is used as the solvent. <2> A reducing reagent is used. <3> An oxidizing agent is used. <4> Acid catalysis is used.
[A]: pharmacology


[Q]: Question: When using the Callista Roy model in practice, the organization of the factors that influence the person's responses are grouped as stimuli: 
 Options:  <0> Innatos and acquired. <1> Adaptive and ineffective <2> Focal, contextual and residual. <3> Internal and external. <4> Physiological, psychological and sociocultural.
[A]: nursery


[Q]: Question: For the care of the nipple cracks during lactation it is recommended: 
 Options:  <0> Washed with water and neutral pH soap after each feeding. <1> Spread a few drops of milk and let air dry after the tetada. <2> The use of healing ointments. <3> 70º alcohol applied through sterile gauze between shots. <4> Apply cold between shots.
[A]:
nursery