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
Air bronchogram indicates 
Select and explain. 
A. Intrapulmonary pathology, B. Pleural pathology, C. Mediastinal pathology, D. All the above
A: Intrapulmonary pathology
Answer: A: Intrapulmonary pathology 
Explanation: Air bronchogram indicates Intrapulmonary pathology.
It excludes any pleural and mediastinal pathology.