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
The first step in management of head injury is: 
Select and explain. 
A. Secure airway, B. I.V. mannitol, C. I.V. dexamethasone, D. Blood transfusion
A: Secure airway
Answer: A: Secure airway 
Explanation: None