This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
Dohlmann&;s procedure is done in 
Select and explain. 
A. Zenkers diveiculum, B. Barretts oesophagus, C. Schatzki ring, D. Achalasia cardia
A: Zenkers diveiculum
Answer: A: Zenkers diveiculum 
Explanation: PHARYNGEAL POUCH Also called hypopharyngeal diveiculum or Zenker's diveiculum, it is a pulsion diveiculum where pharyngeal mucosa herniates through the Killian's dehiscence--a weak area between two pas of the inferior constrictor. TREATMENT :- 1. Excision of pouch and cricopharyngeal myotomy. This is done through cervical approach. 2. Dohlman's procedure. The paition wall between the oesophagus and the pouch is divided by diathermy through an endoscope. This is done in poor risk debilitated patients. 3. Endoscopic laser treatment. It is similar to Dohlman's procedure. Paition between the pouch and oesophagus is divided by CO2 laser using operating microscope. Ref:- Dhingra; pg num:-274,275