This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
[{'content': 'Laryngeal mask airway is used for \nSelect and explain. \nA. Airway maintenance, B. Cardiopulmonary resuscitation, C. Positive pressure ventilation, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Laryngeal mask airway is used in airway maintenance, cardiopulmonary resuscitation, positive pressure ventilation', 'role': 'assistant'}]