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: Surgery
[{'content': 'Guedel airway is a type airway adjunct: \nSelect and explain. \nA. Oropharyngeal., B. Nasopharyngeal., C. Orotracheal., D. Nasotracheal.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]