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: Anatomy
Predisposing factors for esophagal cancer is all except 
Select and explain. 
A. Mediastinal fibrosis, B. Diveicula, C. Caustic alkali burn, D. HPV
A: Mediastinal fibrosis
Answer: A: Mediastinal fibrosis 
Explanation: Refer Robbins page no 758-759 External beam irradiation but not mediastainal fibrosis is a risk factor for esophagal cancer *HPV DNA is found frequently in esophagal squamous cell carcinoma in high incidence