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: What is the procedure called instrumental conditioning in which the instrumental response eliminates or prevents the occurrence of an aversive stimulus ?: 
 Options:  <0> Positive reinforcement. <1> Punishment. <2> Negative reinforcement. <3> Omission. <4> Extinction.

A: psychology
****
Q: Question: A 16-year-old boy who consulted due to pultulose tonsillitis, fever up to 38.5ºC, painful cervical adenopathies, non-pruritic macular exanthema in the thorax and mild hepatosplenomegaly, 4-5 days old. The Paul-Bunnell test and the IgM for the Epstein-Barr virus are positive. During his admission he develops a continuous fever of up to 40ºC, pancytopenia, icteric hepatitis and coagulopathy of progressive intensity. One week after admission, he was transferred to the ICU due to confusion and respiratory failure. The blood cultures and a urine culture are negative, the CSF is normal and the chest plate does not show infiltrates. Procalcitonin is normal, but PCR and ferritin are very high. From the statements below, what would be the most correct diagnostic and therapeutic approach? 
 Options:  <0> It has a bacterial sepsis of undetermined origin and should be administered ceftriaxone and supportive treatment. <1> It has a bacterial sepsis of undetermined origin and should be administered vancomycin, ceftacidime and supportive treatment. <2> It is an infectious mononucleosis of severe course and glucocorticoids must be administered. <3> It is an infectious mononucleosis of severe course and treatment with acyclovir should be started. <4> Perform a biopsy / aspirate of bone marrow and if hemophagocytosis is confirmed, start treatment with immunosuppressants.

A: medicine
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Q: Question: What specific procedure of the experimental strategy makes it the most appropriate to test hypotheses of causality? : 
 Options:  <0> The representative sampling of the participants. <1> The manipulation of the independent variable with control of possible strange variables. <2> The realization of the study in real contexts with natural groups. <3> The identification of possible predictor variables through the retrospective analysis of the study phenomenon. <4> The application of statistical techniques for the analysis of data.

A:
psychology
****