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
All are Precancerous for carcinoma esophagus Except 
Select and explain. 
A. Achalasia, B. Paterson-Brown-Kelly syndrome, C. Zenker's diveiculum, D. Ectodermal dysplasia
B: Paterson-Brown-Kelly syndrome
Answer: B: Paterson-Brown-Kelly syndrome 
Explanation: .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