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: The ascorbic acid esters are used in Pharmaceutical Technology as: 
 Options:  <1> Reducers <2> Blockers <3> Synergists <4> Chelators <5> Antiseptics
