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: Temperature is one of the important variables in the emission techniques, because:
Options: <0> The energy emitted by the atoms varies exponentially with it. <1> The population of atoms in the excited state decreases when it increases. <2> The population of atoms in the excited state increases when it decreases. <3> By increasing the atoms evaporate and the analytical signal decreases. <4> When increasing it increases the power of the electromagnetic radiation coming from the hollow cathode lamp.
chemistry