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
Shoest acting local anesthetic agent is 
Select and explain. 
A. Procaine, B. Lidocaine, C. Tetracaine, D. Bupivacaine
A: Procaine
Answer: A: Procaine 
Explanation: Classification Amide type Long acting * Bupivacaine * Levo-Bupivacaine * Ropivacaine * Dibucaine Intermediate acting * Lidocaine (lignocaine) * Mepivacaine * Prilocaine * Aicaine Ester type Long acting * Tetracaine (amethocaine) Intermediate acting * Cocaine Sho acting * Procaine * Chloroprocaine * Benzocaine * Proparacaine i.e. Procaine Ref: willer 10th ed.