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: ENT
Steeple sign is seen in: 
Select and explain. 
A. Croup, B. Acute epiglottitis, C. Laryngomalacia, D. Quinsy
A: Croup
Answer: A: Croup 
Explanation: In radiology, the steeple sign is a radiologic sign found on a frontal neck radiograph where subglottic tracheal narrowing produces the shape of a church steeple within the trachea itself. The presence of the steeple sign suppos a diagnosis of croup, usually caused by paramyxoviruses.