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: 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.
[A]: biology


[Q]: Question: A 24-year-old boy who, after 3 days of high-risk sexual contact, has numerous pustular, small, very pruritic lesions that progress to minute erosions affecting the entire glans and inner face of the prepuce. Indicate which is, among the following, the most probable diagnostic orientation: 
 Options:  <0> Genital candidiasis <1> Chancroid. <2> Secondary syphilis <3> Balanitis by Trichomonas. <4> Fungal infection by dermatophytes.
[A]: medicine


[Q]: Question: Within the main phases of extrusion and spheronization we have: 
 Options:  <0> Dry mix, wet kneading and compaction. <1> Wet kneading, compaction and drying. <2> Wet mixing, compaction, and drying. <3> Wet kneading, drying and sieving. <4> Kneading dry, drying and sieving.
[A]:
pharmacology