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.

[EX 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.
[EX A]: medicine

[EX Q]: Question: In the oxaciclohexane-type conformer of sugar -D - (+) - glucopyranose: 
 Options:  <0> One of the OH- groups is axial, but the remaining substituents are equatorial. <1> The CH2OH group is axial but the remaining groups are equatorial. <2> All groups are axial. <3> All groups are equatorial. <4> The CH2OH group is equatorial but the remaining groups are axial.
[EX A]: chemistry

[EX Q]: Question: On a blood agar plate, a greenish or brown halo around a bacterial colony indicates that the bacteria produces: 
 Options:  <0> A siderophore. <1> α hemolysis. <2> Coagulase <3> β galactosidase. <4> Neutral metabolites
[EX A]:
biology