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 potentiometric titration is always done at i = 0: 
 Options:  <1> Yes, because that is where the Nernst equation is fulfilled. <2> Yes, because it is an instrumental requirement. <3> No, because there are potentiometric titrations at constant i. <4> No, because potentiometric titrations are never made at i = 0. <5> Yes, as long as an indicator electrode and a reference electrode are used.
