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 used for local infiltration except ? 
Select and explain. 
A. Lidocaine, B. Ropivacaine, C. Dibucaine, D. Bupivacaine
C: Dibucaine
Answer: C: Dibucaine 
Explanation: Ans. is 'c' i.e., Dibucaine