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: Pediatrics
A 3 month old child has moderate fever and non productive cough and mild dyspnea. After course of mild antibiotic the condition of the child improved transiently but he again develops high fever, productive cough and increased respiratory distress. Chest X ray shows hyperluscency and PFT shows obstructive pattern. Most probable diagnosis is 
Select and explain. 
A. Alveolar microlithiasis, B. Post viral syndrome, C. >Follicular bronchitis, D. >Bronchiolitis obliterans
D: >Bronchiolitis obliterans
Answer: D: >Bronchiolitis obliterans 
Explanation: Bronchiolitis obliterans Repeat from Nov 08 Q no.130