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
Gateway of tears is: 
Select and explain. 
A. Rathke pouch, B. Sinus of morgagni, C. Killians dehiscence, D. Pharyngeal bursa
C: Killians dehiscence
Answer: C: Killians dehiscence 
Explanation: Killians dehiscence is also called 'gateway of tears'