<prompt> Investigation of choice for Zenker;s diveiculum is -Barium swallowEndoscopyEsophageal manometryCT  <response>: Barium swallow is the contrast study from oral cavity upto the fundus of stomach. Indications : Dysphagia and obstruction Motility disorders of esophagus. Assessment of site of esophageal perforation Zenkers diveiculum and cricoid webs. Contraindications : Tracheo esophageal fistula Esophageal perforation 