This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'Most common site of instrumentation perforation in oesophagus is \nSelect and explain. \nA. Cervical, B. Esophago gastric junction, C. Intra-abdominal, D. Lower l/3rd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans) a (Cervical) Ref sabiston 18th ed pi 110Endoscopic procedures are the most common cause of iatrogenic esophageal perforation, with the cricopharyngeal area most commonly injured.', 'role': 'assistant'}]