This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of the Respiratory Tract, Subject name: Pediatrics
Steeple sign is seen in - 
Select and explain. 
A. Acute epiglottis, B. Laryngotracheobronchitis (croup), C. In both cases, D. None of above
B: Laryngotracheobronchitis (croup)
Answer: B: Laryngotracheobronchitis (croup) 
Explanation: Ans. is 'b' i.e., Laryngotracheobronchitis (croup) Croupo Me cause of acute upper airway obstruction,o Mild upper RTI for 1-3 days followed by upper airway obstruction,o Barking cough, hoarsness, Inspiratory stridor,o X-ray shows subglottic narrowing or steeple sign.Acute epiglottitiso Acute potential fatal condition,o Redpiratry progressine respiratory obstruction,o Cherry red swollen epiglottis,o X-ray show's thumb sign.The steeple sign as seen on an anteroposterior neck X-ray of a child with croupNeck X-ray showing thumb sign.