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: Starch is a specific indicator used to indicate the endpoint in redox titrations with: 
 Options:  <1> Cerium. <2> Iodo. <3> Bromine. <4> Permanganate. <5> Dichromate
Output:
2