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
The Barium Swallow shows? 
Select and explain. 
A. Achalasia cardia, B. GERD, C. Nut cracker esophagus, D. Malignancy
C: Nut cracker esophagus
Answer: C: Nut cracker esophagus 
Explanation: Ans. (c) Nut cracker esophagus.