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.

[EX Q]: Question: Which of the following is currently the only contraindication for conservative surgical treatment in breast cancer?
Options: <0> Prior radiotherapy. <1> Tumor of 4 cm. <2> Axillary metastasis. <3> Multifocal tumor <4> Pregnancy of 32 weeks.
[EX A]: medicine

[EX Q]: Question: The thromboxanes:
Options: <0> They induce platelet aggregation. <1> They inhibit platelet aggregation. <2> They act as bronchodilators in the respiratory system. <3> They are produced in the membranes of all cells. <4> They are derived from saturated fatty acids.
[EX A]: chemistry

[EX Q]: Question: Tics can be associated with altered behaviors that arise at a certain time. When the symptoms appear between 35 and 45 years, according to Shapiro's classification, to what tic we refer?
Options: <0> Simple acute tic. <1> Chronic simple tic. <2> Huntington's Korea. <3> Chronic multiple tic. <4> Multiple tic of the adult.
[EX A]:
psychology