<prompt> 50 year old male with Gastroesophageal reflux disease- Diagnosis?Squamous metaplasiaColumnar metaplasiaDysplasiaMalignancy  <response>: Ans. b Columnar metaplasia Histological findings of barrett esophagusMetaplastic columnar epithelium specialized with goblet cells is seen adjacent to squamous epithelium of esophagus hence suggestive of columnar metaplasiaLong-segment: Barretts mucosa extends 3 cm or more. Short-segment: Barretts mucosa extends less than 3 cm 