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
Barrett's esophagus is diagnosed by 
Select and explain. 
A. Squamous metaplasia, B. Intestinal metaplasia, C. Squamous dysplasia, D. Intestinal dysplasia
B: Intestinal metaplasia
Answer: B: Intestinal metaplasia 
Explanation: 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.