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
"Thumb sign" in laterral X - ray neck seen in 
Select and explain. 
A. Epiglottitis, B. Internal hemouhage, C. Carcinoma epiglottis, D. Saccular cyst
A: Epiglottitis
Answer: A: Epiglottitis 
Explanation: None