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': "True about Barret's esophagus: \nSelect and explain. \nA. Long esophageal segment involved, B. Metaplasia, C. Peptic ulcer, D. All", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'a', 'b', 'c' i.e. Long esophageal segment involved, Metaplasia, Peptic ulcerBarrett's esophagus can be classified into long segment disease (involvement of more than 3 cm of esophagus) and sho segment disease ( < 3 cm involvement).Long segment disease carries more risk for adenocarcinoma", 'role': 'assistant'}]