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: A columbimétrica valuation: 
 Options:  <1> It is always done at controlled potential. <2> Always use a platinum macroelectrode. <3> It does not need a system indicating the end point. <4> You need the current to be controlled. <5> You always need the titrant to be added from a burette.
