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': 'Level V Lymph nodes include: \nSelect and explain. \nA. Pretracheal & Prelaryngeal  lymph nodes, B. Mediastinal lymph nodes, C. Lower juglar lymph nodes, D. Posterior triangular lymph nodes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Level IA: Submental\nLevel IB: Submandibular\nLevel II: Upper juglar\nLevel III: Middle juglar\nLevel IV: Lower juglar\nLevel V: Posterior triangle lymph nodes\nLevel VI: Central\nLevel VII: Mediastinal.', 'role': 'assistant'}]