This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': "All are the predisposing factors for carcinoma esophagus except \nSelect and explain. \nA. Achalasia, B. Tylosis palmaris, C. Zenker's diveiculum, D. Ectodermal dysplasia", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Risk factors for SCC:SmokingAlcoholIngested carcinogens Chronic AchalasiaLye (caustic) ingestionLong-term ingestion of hot liquidsPlummer Vinson syndromeTylosis palmaris et plantarisHuman papilloma virusEsophageal diveiculaDeficiency: Vitamin A, zinc, molybdenumRef: Harrison; 19th edition', 'role': 'assistant'}]