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
Best prognostic factor for head injury is 
Select and explain. 
A. A.Glasgow coma scale, B. B.Age, C. C.Mode of injury, D. D.CT
A: A.Glasgow coma scale
Answer: A: A.Glasgow coma scale 
Explanation: The severity of head injury is classified according to glassglow coma scale(GCS) as it is the best predictor of neurological outcome. Mode of injury and age of the patient help in initial evaluation and management, CT helps in confirmation of the diagnosis. Their prognostic value is less when compared to GCS. Reference: Bailey and Love's Sho Practice of Surgery, 26th edition, Pg no:313