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: Medicine
A man aged 60 years presents with intermittent dysphagia & foul breath. He regurgitates food that is eaten few days ago: Likely diagnosis is: 
Select and explain. 
A. Zenker's diveiculum, B. Meckel's diveiculum, C. Scleroderma, D. Achalasia cardia
A: Zenker's diveiculum
Answer: A: Zenker's diveiculum 
Explanation: Answer is A (Zenker's diveiculum) Essentials of Diagnosis : Zenker's Diveiculum (Current Otolaryngology) Dysphagia (Intermittent) Regurgitation of undigested food (with risk of aspiration) Gurgling sounds in neck Halitosis