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
[{'content': 'In a patient with head injury damage in the brain is aggravated by: \nSelect and explain. \nA. Hyperglycemia, B. Hypothermia, C. Hypocapnia, D. Serum osmolality', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Hyperglycemia* Hyperglycemia will injure the micro vessels in brain and cause more damage.* It is a cause of secondary brain injury.', 'role': 'assistant'}]