Which of the following local anaesthetics is most likely to produce an allergic reaction –: (A) Prilocaine, (B) Ropivacaine, (C) Etidocaine, (D) Benzocaine
Answer is D. There is high incidence of allergic reaction with ester local anesthetics because of para-aminobenzoic acid.
Amongst the given options only benzocaine is an ester.