This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pathology
True about Barrett's esophagus is? 
Select and explain. 
A. Squamous metaplasia, B. Columnar metaplasia, C. irreversible, D. Cancerous
B: Columnar metaplasia
Answer: B: Columnar metaplasia 
Explanation: Barrett Esophagus Barrett esophagus is a complication of chronic GERD that is characterized by intestinal metaplasia within the esophageal squamous mucosa. TEXT BOOK OF ROBBINS BASIC PATHOLOGY NINTH EDITION PAGE.561 IMAGE REF: