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: Surgery
[{'content': "Adenocarcinoma in oesophagus occurs in \nSelect and explain. \nA. Midline oesophagus, B. Upper oesophagus, C. Barrett's esophagus, D. Zenkers diveiculum", 'role': 'user'}, {'content': "Answer: C \nExplanation: BARRETT's ulcer is an ulcer in columnar epithelium lined Barrett's oesophagus. It is more prone for Bleeding, Perforation, and Adenocarcinoma of oesophagus( very high, more than 40 times). Treatment for Barrett's ulcer is endoscopic biopsy and resection. Reference: SRB's Manual of Surgery, 6th Edition, page no= 788.", 'role': 'assistant'}]