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': "The basic pathology of Barrett's esophagus is: \nSelect and explain. \nA. Metaplasia of columnar cells to squamous cells, B. Metaplasia of squamous cells to columnar cells, C. Dysplasia of Epithelium, D. Low pressure in Lower sphincter", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Metaplasia of squamous cells to columnar cellsRef: Bailey and Love 26th Edition, Page 1000* Metaplasia of squamous cells to intestinal type of columnar cells is Barret* The biopsy shows Goblet cells: Pathognomonic.', 'role': 'assistant'}]