<prompt> Barretts oesophagus is -Lower oesophagus lined by columnar epitheliumUpper oesophagus lined by columnar epitheliumLower oesophagus lined by ciliated epithelium epitheliumLower oesophagus lined by ciliated epithelium  <response>: Ans. is a i.e., Lower esophagus lined by columnar ephithelium Barretts esophagus Is metaplastic change ,of gastro esophageal mucosa from normal squamous epithelium to columanar epithelium, in response to chronic gastro -esophageal reflux. o The function between squamous esophageal mucosa and gastric mucosa moves proximally . o Three types of columnar epithelium have been described in Barretts esophagus : i Intetinal type -the most common type ii The junctional type and iiiThe gastiric fundic type o Barretts esophagus is a premalignant codition for adenocarcinoma esophagus o The hallmark of inestinal metaplasia is the presence of intestinal goblet cells. 