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': 'The first drug used as local anaesthetic is ? \nSelect and explain. \nA. Cocaine, B. Prilocaine, C. Procaine, D. Lidocaine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is'a' i.e., CocaineCocaine was the first local anaesthetic used by Carl Koller. It was used for anaesthetizing cornea.", 'role': 'assistant'}]