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: 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
[A]: medicine


[Q]: Question: With respect to the peptide bond, indicate which of the following statements is FALSE: 
 Options:  <0> It has partial character of double bond. <1> Form a small dipole. <2> Its formation involves the elimination of a molecule of water. <3> The peptide chain rotates freely through the peptide bond. <4> In an amide link.
[A]: chemistry


[Q]: Question: Which coenzyme is involved in the synthesis of nitric oxide (NO)? 
 Options:  <0> NADH <1> NADPH. <2> FAD. <3> CoA. <4> Thiamine.
[A]:
chemistry