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: By means of the angular methods used to evaluate the flow properties of a powder, it is determined:
Options: <0> The ease with which the solid sets in motion. <1> The angle of repose. <2> The flow velocity <3> The resistance to displacement. <4> The density of the powder.
[A]: pharmacology

[Q]: Question: Which of the following situations would noticeably decrease the transcription of a gene?
Options: <0> The presence of a repressor and an inducing molecule. <1> The binding of RNA polymerase to DNA. <2> The presence of a repressor and a correpressor molecule. <3> The presence of an activator and its signal molecule. <4> The presence of a mutated repressor that could not bind to DNA.
[A]: pharmacology

[Q]: Question: In anorexia nervosa, and in relation to menstrual / reproductive function, which of the statements is true according to the DSM-IV-TR criteria?
Options: <0> The existence of amenorrhea is a basic diagnostic criterion. <1> We do not consider that the amorrea is significant until the patient has presented it for at least one year. <2> The amorrea, when it exists, is always primary, never secondary. <3> Amorrhea is a characteristic of this disorder but not a basic diagnostic criterion. <4> Without the presence of amorrea, anorexia nervosa can be diagnosed.
[A]:
psychology