This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Air bronchogram in Chest X-ray is found in all except 
Select and explain. 
A. Pleural effusion, B. Consolidation, C. Pulmonary oedema, D. Alveolar cell carcinoma
A: Pleural effusion
Answer: A: Pleural effusion 
Explanation: An air bronchogram is a tubular outline of an airway made visible by filling of the surrounding alveoli by fluid or inflammatory exudates. Causes of Air Bronchogram a. Pulmonary oedema b. Pneumonic consolidation c. Hyaline membrane disease d. Lymphoma e. Alveolar cell carcinoma f. Sarcoidosis g. ARDS h. Alveolar proteinosis ref - pubmed.com