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.
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Question: 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.

Answer: biology

Question: Question: Which of the following statements is true with respect to the alkaloid morphine ?:
Options: <0> It is an isoquinoline alkaloid extracted from straw of Papaver somniferum. <1> It is a benzylisoquinol alkaloid extracted from latex of Papaver somniferum. <2> It is a tracheal alkaloid extracted from leaves of Papaver somniferum. <3> It is a quinolizidine alkaloid extracted from capsules of Papaver somniferum. <4> It is a pyrrolidinic alkaloid extracted from roots of Papaver somniferum.

Answer: pharmacology

Question: Question: Why mechanism produces hyperprolactinemia haloperidol ?:
Options: <0> Blockade of alpha 1 adrenergic receptors. <1> Blockade of alpha-2 adrenergic receptors <2> Blocking of H1 receivers. <3> Blockade of D2 receivers. <4> Blocking of 5-HT2 receptors.

Answer:
pharmacology