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 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 gag
A: Patency of airway
Answer: A: Patency of airway 
Explanation: A i.e. Patency of airway