This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Radiology
Cork screw appearance on barium swallow is seen in- 
Select and explain. 
A. Achlasia cardia, B. Carcinoma esophagus, C. Hiatus hernia, D. Diffuse esophageal spasm
D: Diffuse esophageal spasm
Answer: D: Diffuse esophageal spasm 
Explanation: Ans. is 'd' i.e., Diffuse esophageal spasm * "Cork screw esophagus" on barium study is seen in diffuse esophageal spasm.* In diffuse esophageal spasm, barium swallow shows that normal sequential peristalsis below the aortic arch is replaced by uncoordinated simultaneous contractions that produce the appearance of curling or multiple ripples in the wall, sacculation and pseudodiverticula - the "Corkscrew" esophagus.Note: Though diffuse oesophageal spasm is best seen on barium swallow, it is diagnosed by oesophageal manometry.* That means:-A. Best investigation for visualization of diffuse esophageal spasm - Barium swallows.B. Investigation of choice for diagnosis of diffuse esophageal spasm - Manometry