This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pediatrics
Chest radiographs of children with foreign body aspiration 
Select and explain. 
A. Are always abnormal, B. May show over inflation of the involved lung, C. Always show the foreign body, D. Commonly show pneumothorax
B: May show over inflation of the involved lung
Answer: B: May show over inflation of the involved lung 
Explanation: In foreign body aspiration a radiograph is vital as the object may be radio opaque. often its not radio opaque or is obscured by the cardiac shadow or the inflammatory response. over inflation of affectedlung due to inflammatory response. Ref : BAILEY AND LOVE&;S SHO PRACTICE OF SURGERY,24 th edition ,PG NO:852