instruction:
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:
Question: A 71-year-old man presented with severe pancytopenia without any immature cells and with a medullar study suggestive of severe aplastic anemia. What would be the fundamental therapeutic approach? 
 Options:  <0> Treatment with methylprednisolone at a dose of 1 g / Kg / day for 5 days. <1> Study of siblings and if any is HLA compatible, allogeneic transplant of hemopoietic progenitors. <2> Immunosuppressive therapy with cyclosporine and antitimocitic immunoglobulin. <3> Hemotherapeutic support. <4> Chemotherapy and if autologous transplant response of hemopoietic progenitors.
answer:
medicine


question:
Question: A study is carried out to investigate the association between factor X and disease Z. To do this, 120 subjects with the disease and 420 controls (without the disease) are matched by age and sex. In both groups it is found that 20 subjects were exposed to factor X. What is the odds ratio (OR) between factor X and disease Z? 
 Options:  <0> OR = 1 (no association). <1> OR = 2. <2> OR = 4 <3> OR = 6 <4> OR = 8
answer:
medicine


question:
Question: An unknown enzyme that affects DNA has been isolated from E. coli. When a solution of this enzyme is mixed with supercoiled plasmid DNA, its only effect is to relax DNA. At the end of the exposure to the enzyme solution, the plasmid DNA is covalently closed and is still circular. This enzyme is one: 
 Options:  <0> Restriction endonuclease. <1> Primasa <2> Reverse transcriptase <3> Helicasa <4> Topoisomerase
answer:

chemistry