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 a amide 
Select and explain. 
A. Lignocaine/Lidocaine, B. Procaine, C. Bupivacaine/Mepivacaine, D. All
B: Procaine
Answer: B: Procaine 
Explanation: B i.e. Procaine