This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Barrets ulcer is due to- \nSelect and explain. \nA. Ischemia, B. Ectopic gastric mucosa, C. Bile reflux, D. Reflux esophagitis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. Reflux esophagitis", 'role': 'assistant'}]