This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
A most common cause of esophageal perforation at the site of cricopharynx - 
Select and explain. 
A. Spontoneous, B. Iatrogenic, C. Traumatic, D. None
B: Iatrogenic
Answer: B: Iatrogenic 
Explanation: Oesophageal perforation is of two types : Iatrogenic (MC) A common site is cervical esophagus Just above the upper sphincter. Spontaneous rupture As seen in Boerhaave's syndrome (Rupture of esophagus are vomiting). Common in the lower 1/3 of esophagus. ref - Internet