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 is seen in: 
Select and explain. 
A. Achalasia cardia, B. Reflux esophagitis, C. Carcinoma oesophagus, D. Hiatus hernia
C: Carcinoma oesophagus
Answer: C: Carcinoma oesophagus 
Explanation: Ans. Carcinoma oesophagus