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: Surgery
True about Barrett's oesophagus - 
Select and explain. 
A. Sequence of prolonged G.E.R., B. It is premalignant, C. Lower oesophageal mucosa is replaced by intestinal type of epithelium, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e. Sequence of prolonged GE reflux; 'b' i.e. It is premalignant; 'c' i.e. Lower esophageal mucosa is replaced by intestinal type