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
In ca esophagus predisposing factors ? 
Select and explain. 
A. Tylosis, B. Smoking, C. Lye stricture, D. All
D: All
Answer: D: All 
Explanation: Answer is 'a' i.e. Tylosis; 'b' i.e. Smoking; 'c' i.e. Lye stricture