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': 'Emergency oxygen flush in anaesthetic machine provides \nSelect and explain. \nA. 35-75L/min oxygen at 55 to 60 Psi pressure, B. 25-35L/min oxygen at 10 to 12 Psi pressure, C. 55-75L/min oxygen at 55 to 60 Psi pressure, D. 10-20L/min oxygen at 10 to 12Psi pressure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Emergency oxygen flush delivers more than normal amount of oxygen at higher pressure to stabilize the patient.', 'role': 'assistant'}]