This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Esophageal Perforation, Subject name: Surgery
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: Ans. is 'b' i.e., Iatrogenic o Oesophageal perforation is of two types :Iatrogenic (MC)Common site is cervical esophagus Just above the upper sphincter.Spontaneous rupturey As seen in Boerhaaves syndrome (Rupture of esophagus after vomitting).Common in the lower 1/3 of esophagus.