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: Surgery
[{'content': "All are Precancerous for carcinoma esophagus Except \nSelect and explain. \nA. Achalasia, B. Paterson-Brown-Kelly syndrome, C. Zenker's diveiculum, D. Ectodermal dysplasia", 'role': 'user'}, {'content': "Answer: B \nExplanation: .Aetiology of CARCINOMA OESOPHAGUS includes, *Diet, deficiencies (Vit. A, C, Riboflavin) *Mycotoxin *Alcohol and tobacco Common in men (Fungal contamination of food Common in China - Henan province) *Achalasia cardia In India, common in Oesophageal webs Orissa and Karnataka *Barrett's oesophagus *Plummer -Vinson's syndrome *Corrosive strictures *Tylosis *Nitrosamines Ref: SRB&;s manual of surgery,3 rd ed, pg no 751", 'role': 'assistant'}]