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
[{'content': 'What is untrue about Ludwig angina? \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]