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: Pharmacology
[{'content': 'First local anaesthesia which was used as clinical anaesthesia was: \nSelect and explain. \nA. Lignocaine, B. Lidocaine, C. Cocaine, D. Procaine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cocaine was the first local anaesthesia which was used clinically.', 'role': 'assistant'}]