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
The adenocarcinoma of esophagus-develops in ? 
Select and explain. 
A. Barret's esophagus, B. Long standing achalasia, C. Corrosive stricture, D. Alcohol abuse
A: Barret's esophagus
Answer: A: Barret's esophagus 
Explanation: Ans. is 'a' i.e., Barrett's Esophagus Adenocarcinoma of esophagus almost always arises in Barrett's esophagus. Other option i.e. long standing achalasia, corrosive stricture and alcohol abuse are risk factors for squamous cell Ca of esophagus