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 diverticulum, B. Meckels diverticulum, C. Scleroderma, D. Achalasia cardia
A: Zenkers diverticulum
Answer: A: Zenkers diverticulum 
Explanation: None