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
The most likley diagnosis in a newbron who had a radiopaque shadow with an air fluid level in the chest along with hemiveebrae of the 6th thoracic veebra on plain X-ray is: 
Select and explain. 
A. Congenital diaphragmatic hernia, B. Oesophageal duplication cyst, C. Bronchogenic cyst, D. Staphylococcal pneumonia
B: Oesophageal duplication cyst
Answer: B: Oesophageal duplication cyst 
Explanation: B i.e. Oesophageal duplication cyst