This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Local and Regional Anesthesia), Subject name: Anaesthesia
All are esters EXCEPT: 
Select and explain. 
A. Prilocaine, B. Cocaine, C. Tetracaine, D. Chlorprocaine
A: Prilocaine
Answer: A: Prilocaine 
Explanation: Ans. (a) PrilocaineRef: KDT 6th ed. / 352