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
[{'content': 'Shortest acting local anaesthetic agent is – \nSelect and explain. \nA. Procaine, B. Lidocaine, C. Tetracaine, D. Bupivacaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chlorprocaine is the shortest acting LA. Amongst the given options procaine is shortest acting.', 'role': 'assistant'}]