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: One of the components of injectable formulations are preservatives. This category includes different excipients with different mechanisms of action. Which of the following is used as a chelating agent ?: 
 Options:  <1> Butylhydroxyanisole. <2> Ethylenediaminetetraacetic acid. <3> Ascorbic acid. <4> Propyl gelate <5> Tocopherol.
