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.

[Q]: Question: A conjugated protein is: 
 Options:  <0> A protein that contains chemical components different from the permanently associated amino acids. <1> A protein that contains amino acids with side chains with conjugated bonds. <2> A protein that contains chemical components that make it insoluble. <3> A protein incorrectly folded. <4> A denatured and inactivated protein.
[A]: chemistry


[Q]: Question: The 2,4-diaminopteridine systems, such as aminopterin or methotrexate, are good antitumor agents since they reduce the biosynthesis of purines and pyrimidines by inhibiting the enzyme: 
 Options:  <0> Timidylate synthetase <1> Aromatase <2> Topoisomerase <3> Reverse transcriptase <4> Dihydrofolate reductase.
[A]: pharmacology


[Q]: Question: A person who does not have schizophrenia, or a mood disorder with psychotic symptoms, but who exhibits a deep pattern of social detachment and a limited range of emotional expression in interpersonal situations (eg, enjoyment with few activities or is indifferent to the praise or criticism), presents more likely: 
 Options:  <0> A delusional disorder <1> A social phobia <2> A schizoid personality disorder. <3> A disorder of depersonalization. <4> A Korsakoff syndrome.
[A]:
psychology