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': 'When will you do emergency endotracheal intubation? \nSelect and explain. \nA. GCS<7, B. Tension pneumothorax, C. Cardiac tamponade, D. Bleeding gastric ulcer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans.(a) GCS<7Ref: Ezri T and Warters RD, Chapter 15: Indications for tracheal intubation p. 371-8 * In a case of head trauma if GCS is 8 or less - a definitive airway may be required.', 'role': 'assistant'}]