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.
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Question: Question: The Latin square designs are a type of: 
 Options:  <0> Random designs. <1> Block designs. <2> Intra-subject designs. <3> Mixed designs <4> Unifactorial designs.

Answer: psychology


Question: Question: In the processing and presentation of peptides of extracellular origin intervene (n): 
 Options:  <0> The TAP proteins. <1> The tapasina. <2> The HLA-DM molecule. <3> The proteosome. <4> The HLA-B molecules.

Answer: biology


Question: Question: The recombinant DNA is: 
 Options:  <0> A DNA molecule that activates heterologous recombination. <1> A precursor messenger RNA molecule. <2> A DNA molecule composed of segments covalently linked from two or more sources. <3> A diploid DNA molecule. <4> A multienzyme complex of DNA polymerases covalently linked.

Answer:
chemistry