This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Retrocardiac lucency with air fluid level is seen in not related-radiology 
Select and explain. 
A. Hiatus hernia, B. Distal end esophageal obstruction, C. Eventration of diaphragm, D. Zenker's diveiculum
A: Hiatus hernia
Answer: A: Hiatus hernia 
Explanation: .