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: Surgery
Death in Ludwig's angina occurs due to 
Select and explain. 
A. Sepsis, B. Respiratory obstruction, C. Cavernous sinus thrombosis, D. Carotid blow-out
B: Respiratory obstruction
Answer: B: Respiratory obstruction 
Explanation: None