This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': "An elderly male presents with history of dysphagia, regurgitation foul breath and cough. Bilateral Lung crepts are noted on examination. The most likely diagnosis is - \nSelect and explain. \nA. Shatzki Ring, B. Zenker's Diverticulum, C. Corkscrew Esophagus, D. Plummer-Vinson Syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: Features of Dysphagia, Halitosis (foul breath), regurgitation with cough and aspiration pneumonia (Bilateral Lung Crepts) suggests a diagnosis of Zenker's Diverticulum.", 'role': 'assistant'}]