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: Under physiological conditions, the secondary structure of the most frequent DNA in the cells is: 
 Options:  <0> B-DNA. <1> Z-DNA. <2> A-DNA. <3> G-DNA. <4> H-DNA.
answer:
biology


question:
Question: The following may occur in multimeric form associated with the J chain: 
 Options:  <0> IgA and IgG. <1> IgD and IgM, <2> IdE and IgD. <3> IgA and IgD. <4> IgA and IgM.
answer:
biology


question:
Question: What analysis should be controlled in maintenance treatments with lithium salts? 
 Options:  <0> Hepatic enzymes. <1> Antinuclear antibodies. <2> Ferritin and sideremia. <3> Thyroid and renal function. <4> Tirocalcitonina.
answer:

medicine