This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Rat tail appearance in contrast radiography is seen in? 
Select and explain. 
A. Achalasia cardia, B. Carcinoma esophagus, C. Cork screw esophagus, D. Diffuse esophageal spasms
B: Carcinoma esophagus
Answer: B: Carcinoma esophagus 
Explanation: Carcinoma esophagus REF: sabiston's 18' edition chapter 41 See table in the previous question