This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
Which of the following is called as gateway of Tears 
Select and explain. 
A. Sinus of morgagni, B. Killians dehiscence, C. Passavant ridge, D. Waldeyers ring
B: Killians dehiscence
Answer: B: Killians dehiscence 
Explanation: KILLIAN'S DEHISCENCE Inferior constrictor muscle has two pas: thyropharyngeus with oblique fibres and cricopharyngeus with transverse fibres. Between these two pas exists a potential gap called Killian's dehiscence. It is also called "gateway of tears" as perforation can occur at this site during oesophagoscopy. This is also the site for herniation of pharyngeal mucosa in cases of pharyngeal pouch. Ref:- Dhingra; pg num:-238