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': 'Laryngeal mask airway, all are true except \nSelect and explain. \nA. Less invasive, B. Prevents aspiration, C. Easy to insert, D. Less complications', 'role': 'user'}, {'content': 'Answer: B \nExplanation: LMA cannot prevent aspiration.', 'role': 'assistant'}]