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
Laryngeal oedema - a life-threatening situation is seen
in association with: 
Select and explain. 
A. Cavernous sinus thrombosis, B. Infection of pharyngeal tonsils, C. Ludwig's angina, D. Cellulitis
C: Ludwig's angina
Answer: C: Ludwig's angina 
Explanation: None