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
Which of the following is seen in carcinoma oesophagus - 
Select and explain. 
A. Rat tail appearance, B. Corkscrew appearance, C. Bird beak sign, D. Caterpillar sign
A: Rat tail appearance
Answer: A: Rat tail appearance 
Explanation: Ans. is 'a' i.e., Rat tail appearance Rat tail appearance of esophagusEsophageal carcinomaMegaesophagus (sigmoid esophagus)"Bird beak" appearance Hurst phenomenon Achalasia cardiaYo-Yo motion of barium"Corkscrew" appearance (esophageal curling)Rosary-bead'sheikh kebab configurationChain of bead appearance Diffuse esophageal spasm