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 one of the following is not an amide – 
Select and explain. 
A. Lignocaine, B. Procaine, C. Bupivacaine, D. Dibucaine
B: Procaine
Answer: B: Procaine 
Explanation: Esters (aminoesters) :- Procaine, chlorprocaine, tetracaine (amethocaine), Benzocaine, Cocaine.
Amides (aminoamides) Lignocaine, Mepivacaine, Prilocaine, Bupivacaine, Etidocaine, Ropivacaine , Dibucaine.