This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Murphy eye seen in: \nSelect and explain. \nA. Endotracheal tube, B. Millers blade, C. Macintosh blade, D. FOB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Oxford textbook of anesthesia. Page. 4\n\xa0\nMurphy Eye:\nThe “Murphy eye” is the eponymous name for a hole on the side of most endotracheal tubes (ETTs) that functions as a vent, and prevents the complete obstruction of the patient’s airway, should the primary distal opening of an ETT become occluded\nThe original ET tube by Dr. Murphy', 'role': 'assistant'}]