This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Which of the following local anaesthetics is most likely to produce an allergic reaction – 
Select and explain. 
A. Prilocaine, B. Ropivacaine, C. Etidocaine, D. Benzocaine
D: Benzocaine
Answer: D: Benzocaine 
Explanation: 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.