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': 'Duration of action of paraprocaine is \nSelect and explain. \nA. 20 minutes, B. 10 minutes, C. 20 seconds, D. 10 seconds', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Procaine acts for around 20 minutes, althought it’s onset of action is within 10 seconds.', 'role': 'assistant'}]