A 7 and 1/2 year old girl with non productive cough, mild stidor 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 -

• A. Pulmonary alveolar microlithiasis
• B. Follicular bronchitis
• C. Bronchiolitis obliterans
• D. Hemosiderosis