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: Radiology
[{'content': 'Pappu 2 yrs old boy presents in the causality with H/O sudden onset of respiratory difficulty & stridor on auscultation, ↓ed breath sound & wheeze on the RT side. The X-ray shows RT opaque hemithorax. What will be diagnosis – \nSelect and explain. \nA. Pneumothorax, B. Acute epiglottitis, C. Massive pleural effusion, D. Foreign body aspiration', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Foreign body aspiration should always be considered as a potential cause of stridor and airway obstruction in\xa0children". \xa0\n\nOpaque hemithorax in this child is due to atelectasis which can occur after foreign body aspiration.\nSo, you should keep in mind that foreign body aspiration can cause opaque hemithorax\xa0as well as hyperinflation.', 'role': 'assistant'}]