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: The chemistry of diazonium salts provides the main synthetic method for preparing aryl fluorides by a process called: 
 Options:  <0> Reorganization of Claisen. <1> Gabriel's reaction. <2> Diazotization reaction. <3> Sandmeyer reaction. <4> Schiemann reaction.
chemistry

Question: In the history of the Psychological Evaluation, the Aristotelian Physiognomy makes its influence felt in the later works of the authors: 
 Options:  <0> Krestschmer and Sheldon. <1> Binet and Simon. <2> Discards <3> Juan Huarte from SAN. Juan. <4> Hermann Rorschach.
psychology

Question: They are fragments of the cytoplasm of a precursor cell: 
 Options:  <0> Lymphocytes <1> Megakaryocytes <2> Monocytes <3> Platelets. <4> Erythrocytes

biology