TASK DEFINITION: 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.
PROBLEM: Question: The chemical reactions of the splicing process of the introns during the maturation of the pre-mRNAs consists of: 
 Options:  <0> An oxidation-reduction reaction. <1> A transesterification reaction. <2> Two sequential transesterification reactions. <3> Three sequential transesterification reactions. <4> A transesterification reaction followed by another oxidation reaction.

SOLUTION: chemistry

PROBLEM: Question: Immunoglobulin isotype change affects: 
 Options:  <0> The constant regions of the heavy chains. <1> The constant regions of the light chains. <2> The totality of heavy chains. <3> The entire immunoglobulin molecule. <4> The hypervariable regions of the heavy chains.

SOLUTION: biology

PROBLEM: Question: The sensitivity of a diagnostic test is related to: 
 Options:  <0> Its ability to discriminate true positives. <1> Its ability to discriminate true negatives. <2> Its ability to discriminate against false positives. <3> Its ability to discriminate against false negatives. <4> The high cut point.

SOLUTION:
psychology