<prompt> Commonest complication of Zenkers diveiculum isDysphoniaGastroesophageal refluxLung abscessPerforation  <response>: Ans is c ie Lung abscess Pulmonary infection is the most frequent serious complication, and many patients are first seen after experiencing repeated episodes of pneumonia. -CSDT Aspiration pneumonia Lung abscess are the most frequent complications of Zenkers diveiculum. Other rare complications are: Perforation Bleeding Carcinoma 