Task: Text Categorization
Input (English): Question: A columbimétrica valuation: 
 Options:  <0> It is always done at controlled potential. <1> Always use a platinum macroelectrode. <2> It does not need a system indicating the end point. <3> You need the current to be controlled. <4> You always need the titrant to be added from a burette.
Output (English): chemistry