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': 'All are precancerous lesions for carcinoma of esophagus except \nSelect and explain. \nA. Achalasia, B. Paterson Kelly syndrome, C. Zenker Diveiculum, D. Ectodermal dysplasia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Refer Robbins page no Pg 758-9 A Zenker's diveiculum, more formally known as a hypopharyngeal diveiculum, is a pouch that can form at the junction of the hypopharynx (lower pa of the throat) and the esophagus, an area known as Killian's Triangle", 'role': 'assistant'}]