Task: Text Categorization
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:  <0> Butylhydroxyanisole. <1> Ethylenediaminetetraacetic acid. <2> Ascorbic acid. <3> Propyl gelate <4> Tocopherol.
Output (English): pharmacology