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: The main method for the preparation of βceto esters is the reaction known as: 
 Options:  <0> Malonic synthesis <1> Acetoacetic synthesis. <2> Condensing of Claisen. <3> Perkin reaction. <4> Hofmann reaction.
answer:
pharmacology


question:
Question: The arginosuccinasa: 
 Options:  <0> In an enzyme of the citric acid cycle. <1> Converts arginine to lysine. <2> It is activated by the allosteric effector N-acetylglutamate. <3> It produces fumarate. <4> It is a glycogenic amino acid.
answer:
chemistry


question:
Question: A complication of transplantation of hematopoietic precursors is: 
 Options:  <0> Common variable immunodeficiency. <1> Graft-versus-host disease. <2> Immunodeficiencies in complement components. <3> The lack of NK lymphocytes. <4> Chronic granulomatous disease.
answer:

biology