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
Zenker's diveiculum is called as 
Select and explain. 
A. Prepharyngeal diveiculum, B. Pharyngobasilar diveiculum, C. Pharyngotympanic diveiculum, D. Hypopharyngeal diveiculum
D: Hypopharyngeal diveiculum
Answer: D: Hypopharyngeal diveiculum 
Explanation: Ans. is 'd' i.e., Hypopharyngeal diveiculum Hypopharyngeal diveiculum or Zenker's diveiculum or pharyngeal pouchIt is a pulsion diveiculum where pharyngeal musoca herniates through the killian's dehiscence, a weak area between two pas of the inferior constrictor.It is the most common esophageal diveiculum.The diveicula arises posteriorly in the midline of neck. The mouth of the diveicula is in the midline but the sacprojects laterally (usually left laterally )Zenker's diveicula are rarely seen below 30 yrs of age, most patients are over 50.