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: Pathology
[{'content': "The fascial spaces involved in Ludwig's angina are \nSelect and explain. \nA. Unilateral -submandibular & sublingual spaces, B. Bilateral - submandibular & sublingual spaces, C. Unilateral - submandibular, sublingual & submental spaces, D. Bilateral -submandibular, sublingual & submental spaces", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]