<prompt> Shoest acting local anesthetic agent isProcaineLidocaineTetracaineBupivacaine  <response>: 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. 