This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous General Anesthesia, Subject name: Anaesthesia
Agent with shortest acting period - 
Select and explain. 
A. Procaine, B. Lignocaine, C. Bupivacaine, D. Dibucaine
A: Procaine
Answer: A: Procaine 
Explanation: Ans. is 'a' i.e., ProcaineShort durationLow potencyIntermediate duration (30-90 min)Intermediate potencyLong duration (> 120 min)High potencyo Chlorprocaine (shortest acting)o Procaineo Lignocaineo Mepivacaineo Prilocaineo Cocaineo Bupivacaineo Tetracaineo Etodicaineo Ropivacaineo Dibucaine (longest acting)