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: Surgery
Adenocarcinoma in oesophagus occurs in 
Select and explain. 
A. Midline oesophagus, B. Upper oesophagus, C. Barrett's esophagus, D. Zenkers diveiculum
C: Barrett's esophagus
Answer: C: Barrett's esophagus 
Explanation: BARRETT's ulcer is an ulcer in columnar epithelium lined Barrett's oesophagus. It is more prone for Bleeding, Perforation, and Adenocarcinoma of oesophagus( very high, more than 40 times). Treatment for Barrett's ulcer is endoscopic biopsy and resection. Reference: SRB's Manual of Surgery, 6th Edition, page no= 788.