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': 'In a patient with multiple injuries, first thing is to be done is \nSelect and explain. \nA. Patency of airway, B. Maintenance of B.P., C. Immobilize cervical spine, D. Lateral position with mouth gas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]