Q: 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: Capillary isotachophoresis (CITP) separates:
Options: <0> Cations but can not separate anions. <1> Anions but can not separate cations. <2> Cations and anions simultaneously. <3> Cations and anions but not simultaneously. <4> Only neutral molecules.
A:
chemistry