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" is characteristic of? 
Select and explain. 
A. Carcinoma esophagus, B. Hypertrophic pyloric stenosis, C. Diffuse esophageal spasm, D. Sigmoid volvulous
C: Diffuse esophageal spasm
Answer: C: Diffuse esophageal spasm 
Explanation: ANSWER: (C) Diffuse esophageal spasmREF: Wofganag 5th e p. 846/748SignDiseaseRat tail appearanceCarcinoma esophagusBird beak appearanceAchalasiaBeak sign/ double track/ tram trackHyper trophic pyloric stenosisMedusa head colonies on CTRound wormPincer/daw/coiled spring/target/ meniscus signIntussceptionCoffee bean signSigmoid volvulousLead pipe appearanceUlcerative colitisString of kantor/bulTs eyeChron's diseaseThumb printing signIschemic colitisSaw tooth appeance on barium enemaDiverticulosisApple core signCarcinoma colonCork scretv appearanceDiffuse esophageal spasmString signHypertrophic pyloric stenosis