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': 'Polytrauma patient back spine examination is by \nSelect and explain. \nA. Log roll, B. Barrel role, C. Chin lift, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Log rollRef: Bailey 26th edition Page 329 * Log roll is performed for spine examination.* Log roll tor Spine Examination', 'role': 'assistant'}]