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: Pediatrics
The following X-ray depicts 
Select and explain. 
A. Acute Laryngotracheobronchitis, B. Acute Epiglottitis, C. Foreign body aspiration, D. Retropharyngeal abscess
B: Acute Epiglottitis
Answer: B: Acute Epiglottitis 
Explanation: X-ray shows Thumb sign which is diagnostic of acute Epiglottitis