Task: Question Answering
Input (English): 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.
Output (English): 2