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': 'Most common cause of Air bronchogram \nSelect and explain. \nA. Pulmonary edema, B. Consolidation, C. Hyaline membrane disease, D. Alveolar cell carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: All the above are causes of AIr bronchogram.\nM/C cause is consolidation.', 'role': 'assistant'}]