This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
In a patient with head injury damage in the brain is aggravated by: 
Select and explain. 
A. Hyperglycemia, B. Hypothermia, C. Hypocapnia, D. Serum osmolality
A: Hyperglycemia
Answer: A: Hyperglycemia 
Explanation: Ans. (a) Hyperglycemia* Hyperglycemia will injure the micro vessels in brain and cause more damage.* It is a cause of secondary brain injury.