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
[{'content': 'Which is most common site for iatrogenic esophageal perforation? \nSelect and explain. \nA. Abdominal poion, B. Cervical poion, C. Above arch of aoa, D. Below arch of aoa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Esophageal perforation Iatrogenic Spontaneous Most common type Caused by endoscopy MC site is cervical esophagus (cricopharyngeal area) Esophageal rupture after vomiting MC site: left posterolateral side of the distal esophagus', 'role': 'assistant'}]