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
What is untrue about Ludwig angina? 
Select and explain. 
A. It spreads bilaterally, B. Most common cause is dental infection, C. It involves submandibular and sublingual spaces, D. Involvement of submandibular gland and Lymph nodes is common
D: Involvement of submandibular gland and Lymph nodes is common
Answer: D: Involvement of submandibular gland and Lymph nodes is common 
Explanation: None