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 71/2 year old girl with non productive cough, mild stridor for 3 months duration, patient is improving but suddenly developed wheeze, productive cough, mild fever and on x-ray hyperlucency and PFT shows obstructive curve. The most probable diagnosis is, 
Select and explain. 
A. Bronchiolitis obliterans, B. Hemosiderosis, C. Pulmonary alveolar microlithiasis, D. Follicular bronchitis
A: Bronchiolitis obliterans
Answer: A: Bronchiolitis obliterans 
Explanation: Bronchiolitis obliterans Repeat from Nov 08 Q no.130