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': 'The safest initial approach to open airway of patient with maxillofacial trauma is: \nSelect and explain. \nA. Head tilt-chin tilt, B. Jaw thrust technique, C. Head lift-neck lift, D. Heimlich procedure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]