This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Larynx, Subject name: ENT
[{'content': 'Laryngeal mirror is warmed before use by placing: \nSelect and explain. \nA. Glass surface on flame, B. Back of mirror on flame, C. Whole mirror into flame, D. Mirror in boiling water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Glass surface on flame(Ref. Dhingra, 6th ed., 384)Laryngeal mirror is warmed before use by placing the glass surface on flame to prevent fogging caused due to breathing.Putting back of mirror on flame or will heat its back surface also which when held against the soft palate of the patient, while doing I/L, will cause burn injury.', 'role': 'assistant'}]