instruction:
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.
question:
Question: For the analysis of traces of inorganic constituents, in samples of organic nature, a preliminary treatment of the sample is needed, which normally consists of: 
 Options:  <0> Dissolve the sample in cold water. <1> Dissolve the sample in hot water. <2> Dissolve the sample between 30 and 70 ºC. <3> Heat the sample between 400 and 700 ºC. <4> Heat the sample in 0.1 M hydrochloric acid.
answer:
chemistry


question:
Question: What is onychomycosis ?: 
 Options:  <0> An infection of the oral mucosa and gums of infants produced by Candida albicans. <1> A brain abscess in immunosuppressed caused by Aspergillus spp. <2> An infection of the nails by fungi dermatophytes. <3> A serious variety of acne in which fungal species also participate. <4> A lung infection caused by Pneumocystis jirovecii.
answer:
pharmacology


question:
Question: What root predominantly depends on the sensory innervation of the first toe? 
 Options:  <0> L3. <1> L4. <2> L5 <3> S1 <4> L2.
answer:

medicine