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: Unknown
[{'content': 'In cervical lymph node classification, grade VI is marginated at which level? \nSelect and explain. \nA. Submandibular, B. Anterior compament, C. Upper jugular, D. Posterior triangle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Division of Lymph Nodes by Levels', 'role': 'assistant'}]