This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Esophagus, Subject name: Surgery
What is the location of Killian dehiscence? 
Select and explain. 
A. Below Superior constrictor, B. Between Inferior constrictor, C. Below cricopharyngeal muscle, D. Below upper 1/3rd of smooth muscle of oesophagus
B: Between Inferior constrictor
Answer: B: Between Inferior constrictor 
Explanation: Inferior constrictor muscle- Thyropharyngeus above and cricopharyngeus below In between Thyropharyngeus and cricopharyngeus muscle fibres, there is a dehiscence known as Kilian's dehiscence. Protrusion of mucosa and submucosa Kilian's dehiscence is known as Zenker's diveiculum. Larimer's dehiscence- below cricopharyngeus