This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Local and Regional Anesthesia), Subject name: Anaesthesia
[{'content': 'Shortest acting local anesthetic agent is - \nSelect and explain. \nA. Procaine, B. Lidocaine, C. Tetracaine, D. Bupivacaine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Procaine o Chlorprocaine is the shortest acting LA. Amongst the given options procaine is shortest acting.Local Anesthetic agentsShort duration(< 30 min) Low potencyIntermediate duration (30-90 min) Intermediate potencyLong duration (> 120 min) High potencyChlorprocaine (shortest acting)LignocaineMepivacaineBupivacaineTetracaineProcainePrilocaineCocaineEtodicaineRopivacaineDibucaine (longest acting)", 'role': 'assistant'}]