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: What are, among others, the main biases associated with the observer in the framework of observation techniques ?: 
 Options:  <0> The duration of the experiment. <1> The excess of information. <2> The technical accuracy <3> The illusion of learning. <4> The expectation and mechanical errors of registration.

Answer: psychology


Question: Question: Indicate which of the following statements is true about bilirubin: 
 Options:  <0> It is a catabolic product of the heme group. <1> It is a product of the urea cycle. <2> It is an intermediary of the Krebs cycle. <3> It is a precursor of hepatic gluconeogenesis. <4> It is a product of cholesterol degradation.

Answer: chemistry


Question: Question: By what name is the disorder known to be characterized by the constant and persistent repetition of words, ideas, or themes, to which the patient continually appeals ?: 
 Options:  <0> Perseveration of thought. <1> Divagatory thinking. <2> Disintegration of thought. <3> Circumstantiality <4> Inhibition of thought.

Answer:
psychology