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.
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Question: Question: The Latin square designs are a type of: 
 Options:  <0> Random designs. <1> Block designs. <2> Intra-subject designs. <3> Mixed designs <4> Unifactorial designs.

Answer: psychology


Question: Question: It is a genus of strict anaerobic bacteria that produce endospores and that contain pathogenic species: 
 Options:  <0> Bacteroides. <1> Bacillus. <2> Clostridium <3> Corynebacterium <4> Mycobacterium

Answer: biology


Question: Question: Histidine and histamine are two compounds with biological importance that have in common as a structural unit: 
 Options:  <0> Pyridine <1> Piperidine <2> Triazine <3> Phenol. <4> Imidazole

Answer:
chemistry