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: Pharmacology
The drug not belonging to amide group 
Select and explain. 
A. Procaine, B. Xylocaine, C. Lignocaine, D. Bupivacaine
A: Procaine
Answer: A: Procaine 
Explanation: None