<prompt> Oesophageal manometry is used in:Cancer esophagusBarrett esophagusSchatzki ringAchalasia cardia  <response>: Ans. d Achalasia CardiaRef Bailey and Love 26th edition Page 1015 Manometry is the investigation to study the physiology of the functions of esophagus. It is the investigation of choice to detect the motility disorders like achalasia cardia, DES, nut cracker esophagus. Barrett IOC: Endoscopic biopsy Cancer Esophagus IOC: Endoscopic biopsy Zenker IOC: Barium swallow 