Which of the following agents is the most common topical local anesthetic?

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Benzocaine,an ester,is the most commonly used topical local anesthetic.Lidocaine,an amide,is the second most commonly used topical local anesthetic.Tetracaine is an ester of para-aminobenzoic acid (PABA)and has a slow onset and long duration.In view of this drug's high toxicity and the rapidity with which it is absorbed from mucosal surfaces,great care must be exercised if it is used for topical anesthesia.Dyclonine is a topical local anesthetic that is neither an ester nor an amide.

Which of the Following Agents Is the Most Common Topical