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
Esophageal carcinoma is not predisposed by - 
Select and explain. 
A. Achalasia, B. Scleroderma, C. Corrosive intake, D. Barret's esophagus
B: Scleroderma
Answer: B: Scleroderma 
Explanation: Answer is 'b' i.e. Scleroderma