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: A potential receiver: 
 Options:  <0> It is produced by the opening of voltage-dependent channels. <1> Increase its frequency if the intensity of the stimulus increases. <2> It occurs after the binding of the neurotransmitter to the postsynaptic receptor. <3> They occur if the trigger threshold is exceeded. <4> It can be exciter or inhibitor.
biology

Question: Why is chlorophyll green ?: 
 Options:  <0> Absorbs all wavelengths of the visible spectrum. <1> Absorbs wavelengths only from the red and ultra-red parts of the spectrum (680nm, 700nm). <2> Absorbs wavelengths in the red and blue parts of the visible spectrum. <3> Absorbs wavelengths only from the blue part of the visible spectrum. <4> Absorbs in the near ultraviolet.
chemistry

Question: Point out which of the following is more clearly a positive symptom of schizophrenia: 
 Options:  <0> The flat or dull affection. <1> The poverty of language. <2> The associability. <3> Hallucinations <4> The bulimia.

psychology