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
[{'content': 'Predisposing factors for esophagal cancer is all except \nSelect and explain. \nA. Mediastinal fibrosis, B. Diveicula, C. Caustic alkali burn, D. HPV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]