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.

Question: When comparing the characteristics of pragmatic or confirmatory clinical studies with explanatory or exploratory clinical studies, which of the following is an advantage of the former? 
 Options:  <0> Information about subgroups of patients representative of the usual clinical practice. <1> Very homogeneous sample, with little variability. <2> Greater capacity to detect differences in the effectiveness of interventions. <3> Greater internal validity <4> Smaller sample size
medicine

Question: Isopropyl alcohol is prepared from petroleum by hydration of: 
 Options:  <0> Isobutene <1> Eteno <2> Penteno <3> Buteno. <4> Propene
chemistry

Question: One of the main risk factors for kidney cancer is: 
 Options:  <0> Cardiopathy without treatment. <1> Sex. <2> Liver failure. <3> Alcohol intake. <4> Polycystic kidney disease.

nursery