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
[{'content': 'A 7 year old child presents with non productive cough, mild stridor since 6 months. On oral antibiotics, patient is improving but suddenly develops wheezing, productive cough, mild fever. X-ray shows hyperlucency and PFT shows obstructive curve. Most probable diagnosis is - \nSelect and explain. \nA. Post viral syndrome, B. Bronchiolitis obliterans, C. Follicular bronchitis, D. Pulmonary alveolar microlithiasis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Bronchiolitis obliterance", 'role': 'assistant'}]