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
In a patient with multiple injuries, first thing is to be done is 
Select and explain. 
A. Patency of airway, B. Maintenance of B.P., C. Immobilize cervical spine, D. Lateral position with mouth gas
A: Patency of airway
Answer: A: Patency of airway 
Explanation: None