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': "Barrett's esophagus is diagnosed by \nSelect and explain. \nA. Squamous metaplasia, B. Intestinal metaplasia, C. Squamous dysplasia, D. Intestinal dysplasia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Intestinal metaplasiaRef: Sabiston 19th edy page 1033* Barretts esophagus is characterized by metaplasia of esophageal squamous epithelium into columnar in distal esophagus.* For diagnosis of Barretts esophagus it requires both endoscopically visible segment of columnar lining of distal esophagus and intestinal metaplasia showing goblet cells on biopsy.* Barretts esophagus is the single most important risk factor for adenocarcinoma of esophagus.* Adenocarcinoma develops at the squamo-columnar junction or within 2 cm from the junction.', 'role': 'assistant'}]