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: Surgery
A male aged 60 years has foul breath; He regurgitates food that is eaten 3 days ago: Likely diagnosis is: 
Select and explain. 
A. Zenkers diveiculum, B. Meckels diveiculum, C. Scleroderma, D. Achalasia cardia
A: Zenkers diveiculum
Answer: A: Zenkers diveiculum 
Explanation: An aged patient with symptoms of foul breath & regurgitation of food which is eaten 3 days ago, it is a typical presentation of Zenker's diveiculum. Ref: CSDT, 11th Edition, Pages 480, 1330.