Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Capillary isotachophoresis (CITP) separates: 
 Options:  <1> Cations but can not separate anions. <2> Anions but can not separate cations. <3> Cations and anions simultaneously. <4> Cations and anions but not simultaneously. <5> Only neutral molecules.
