This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
Thumb Sign is seen in- 
Select and explain. 
A. Epiglottitis, B. Layngitis, C. CA Larynx, D. Mediastinitis
A: Epiglottitis
Answer: A: Epiglottitis 
Explanation: Ans. is 'a' i.e., Epiglottitis o Thumb sign (thickening of epiglottis) and vallecula sign are seen in epiglottitis.