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
Barrets ulcer is due to- 
Select and explain. 
A. Ischemia, B. Ectopic gastric mucosa, C. Bile reflux, D. Reflux esophagitis
D: Reflux esophagitis
Answer: D: Reflux esophagitis 
Explanation: Ans. is 'd' i.e. Reflux esophagitis