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" seen in 
Select and explain. 
A. Croup, B. Acule epiglottitis, C. Laryngmalacia, D. Quinry
A: Croup
Answer: A: Croup 
Explanation: None