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
The incision for drainage in ludwig's angina extends: 
Select and explain. 
A. Up to the neck, B. To the angle of the mandible, C. Floor of mouth, D. All the above
C: Floor of mouth
Answer: C: Floor of mouth 
Explanation: None