This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'Oesophageal manometry is used in: \nSelect and explain. \nA. Cancer esophagus, B. Barrett esophagus, C. Schatzki ring, D. Achalasia cardia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]