This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head Injury, Subject name: Surgery
Prognosis in head injury is best given by 
Select and explain. 
A. Glasgow coma scale, B. Age of patient, C. Mode of injury, D. CT head
A: Glasgow coma scale
Answer: A: Glasgow coma scale 
Explanation: Ans. is 'a' i.e. Glasgow coma scale Glasgow coma scale is used to determine the conscious level of the patientIt is based on EVM i.e. Eye Opening, Verbal response & Motor responseA) Eye openingB) Verbal responseC) Motor responseSpontaneous - 4 To Voice - 3 To pain - 2 None - 01Oriented - 5 Confused - 4 Inappropriate words - 3 Incomprehensible sound - 2 None -1Obeys commands - 6 Localises pain - 5 Withdraws (pain) - 4 Flexion (pain) - 3 Extension (pain) - 2 None - 1Ranges from 3 to 15.A score of 7 or less is classed as comaA score of 9 or more excludes coma