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: Pathology
[{'content': "Barrett's esophagus is - \nSelect and explain. \nA. Lower esophagus lined by columnar epithelium, B. Upper esophagus lined by columnar epithelium, C. Lower esophagus lined by ciliated epithelium, D. Lower esophagus lined by pseudostratified epithelium", 'role': 'user'}, {'content': "Answer: A \nExplanation: Barrett's esophagus\n\nIs the metaplastic change, of gastroesophageal mucosa from normal squamous epithelium to columnar epithelium, in response to chronic gastroesophageal reflux.\nThe function between squamous esophageal mucosa and gastric mucosa moves proximally\nThree types of columnar epithelium have been described in Barrett's esophagus :\n\n1.\xa0Intestinal type - the most common type\n2.\xa0The junctional type and\n3.\xa0The gastric Jaundice type\n\nBarrett's esophagus is a premalignant condition for adenocarcinoma esophagus\nThe hallmark of intestinal metaplasia is the presence of intestinal goblet cells.", 'role': 'assistant'}]