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': '2 year old child developed sudden bouts of cough, breathlessness and respiratory distress after swallowing coins during playing. Chest x-ray was done. what is the probable diagnosis \nSelect and explain. \nA. Pneumonia on Right side, B. Obstructive emphysema on left side, C. Bronchiectasis, D. Pleural effusion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chest x-ray shows increased lucency on left side, suggesting hyperinflated chest on left side.', 'role': 'assistant'}]