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: ENT
[{'content': 'Gateway of tears is: \nSelect and explain. \nA. Rathke pouch, B. Sinus of morgagni, C. Killians dehiscence, D. Pharyngeal bursa', 'role': 'user'}, {'content': "Answer: C \nExplanation: Killians dehiscence is also called 'gateway of tears'", 'role': 'assistant'}]