<prompt> A 712 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,Bronchiolitis obliteransHemosiderosisPulmonary alveolar microlithiasisFollicular bronchitis  <response>: Bronchiolitis obliterans Repeat from Nov 08 Q no.130 