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: 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.
chemistry

Question: In the processing and presentation of peptides of extracellular origin intervene (n):
Options: <0> The TAP proteins. <1> The tapasina. <2> The HLA-DM molecule. <3> The proteosome. <4> The HLA-B molecules.
biology

Question: They can be part of the B lymphocyte receptor on the cell surface:
Options: <0> IgM and IgG. <1> IgD and IgG. <2> IgD and IgM. <3> IgA and IgM. <4> IgG and IgE.
biology