This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Dohlman's procedure is used in 
Select and explain. 
A. Rectal prolapsed, B. Esophageal achalasia, C. CA oesophagus, D. Zenker's diveiculum
D: Zenker's diveiculum
Answer: D: Zenker's diveiculum 
Explanation: Zenker's diveiculum is a protrusion of mucosa through killian's dehiscence, a weak area of the posterior pharyngeal wall between thyropharyngeus (oblique fibres) and cricopharyngeus (transverse fibres ) of the inferior constrictor muscle of the pharynx. It is a pulsion diveiculum. Dohlman's approach is minially invasive endoscopic technique wherein pouch is excised using double lipped endoscopy. Cautery or laser is used. It is a quicker procedure with shoer duration of anaesthesia and faster recovery. Reference : page 433-34 SRB's manual of surgery 5th edition