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: Relating to topoisomerases: 
 Options:  <0> They are enzymes that convert the D-amino acids into L-amino acids. <1> They are enzymes that synthesize DNA. <2> They are enzymes that participate in the union of the subunits of the ribosome. <3> They are enzymes that denature DNA. <4> DNA gyrase is a special toposiomerase.
[A]: chemistry


[Q]: Question: The blood flow velocity is maximum in: 
 Options:  <0> Great arteries <1> Distribution arteries. <2> Arterioles <3> Capillaries <4> Venules
[A]: biology


[Q]: Question: In relation to malaria, pre-erythrocytic schizonts can be found in: 
 Options:  <0> Reticulocytes <1> Liver cells. <2> Renal cells <3> Lymphocytes <4> Eosinophils
[A]:
biology