General Medicine General bd8b5344 A 7 yr old girl with non productive cough, mild stridor for 3 months duration. Patient is improving but suddenly developed wheeze productive cough mild fever and hyperlucency on CXR and PFT shows obstructive curve. Diagnosis is ? A Bronchiolitis obliterans B Hemosiderosis C Pulmonary alveolar microlithiasis D Follicular bronchitis