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
All are amides except 
Select and explain. 
A. Lignocaine, B. Ropivicaine, C. Bupvicaine, D. Procaine
D: Procaine
Answer: D: Procaine 
Explanation: Procaine