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: 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.
[A]: chemistry


[Q]: Question: A coulometric evaluation: 
 Options:  <0> You do not need the current performance to be 100%. <1> It does not need an indicator system of the end point. <2> Always use a potentiostatic system. <3> It uses a titrant that is generated electrolytically. <4> You need a burette to add the titrant.
[A]: chemistry


[Q]: Question: In consecutive reactions of first order, the global kinetic constant: 
 Options:  <0> Presents units of concentration-1 time-1. <1> Presents units of time-1. <2> Equivalent to the ratio of the kinetic constants of each stage. <3> Corresponds to the sum of the kinetic constants of each stage. <4> Equivalent to the product of the kinetic constants of each stage.
[A]:
pharmacology