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
[{'content': 'The most likely diagnosis in a newborn who had a radiopaque shadow with an air-fluid level in the chest along with hemivertebrae of the 6th thoracic vertebra on plain X-ray is – \nSelect and explain. \nA. Congenital diaphragmatic hernia, B. Oesophageal duplication cyst, C. Bronchogenic cyst, D. Staphylococcal pneumonia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Air-fluid level on the chest in a neonate with hemivertebrae suggests the diagnosis of esophageal duplication cyst.', 'role': 'assistant'}]