This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
[{'content': "Cork screw appearance on barium swallow is seen in: \nSelect and explain. \nA. Achalasia cardia, B. Diffuse esophageal spasm, C. Zenker's diverticulum, D. Scleroderma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Diffuse esophageal spasmRef: SRB Manual of Surgery 4th ed. /1323* Cork screw appearance on barium swallow is seen with diffuse esophageal spasm.* Bird beak appearance is seen with achalasia cardia.* Rat tail appearance as per bailey and love is seen with carcinoma esophagus.', 'role': 'assistant'}]