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
Cork screw appearance on barium swallow is seen in: 
Select and explain. 
A. Achalasia cardia, B. Diffuse esophageal spasm, C. Zenker's diverticulum, D. Scleroderma
B: Diffuse esophageal spasm
Answer: B: Diffuse esophageal spasm 
Explanation: 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.