<prompt> Commonest complication of Zenker;s diveiculum isDysphoniaGastroesophageal refluxLung abscessPerforation  <response>: Commonest complications are lung abcess and pneumonia. It occurs because of Regurgitation during night while turning neck. Othercomplications are abscess in the neck due to infection in the pouch, Carcinoma, Weight loss and cachexia. Reference: SRBs Manual of Surgery, 6th Edition, page no422 