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: Acetylsalicylic acid is a compound whose pKa is 3.5. What percentage of a dose of this product can be absorbed in the stomach fasting (pH 1.5)? 
 Options:  <0> Less than 10% <1> Between 10% and 20%. <2> More than 90% <3> Between 20% and 40%. <4> 50%

A: pharmacology
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Q: 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.

A: medicine
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Q: Question: What is the arrhythmia that most often triggers sudden death in a context of acute ischemic heart disease? 
 Options:  <0> Extrasist. <1> Ventricular tachycardia <2> Ventricular fibrillation. <3> Atrial fibrillation <4> Autrioventricular block.

A:
pharmacology
****