This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and Physiology of Pharynx, Subject name: ENT
[{'content': 'Submandibular nodes are classified as - \nSelect and explain. \nA. Level 1A neck nodes, B. Level IB neck nodes, C. Level II neck nodes, D. Level III neck nodes', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 6b' i.e., Level IB neck nodes Division of neck nodes according to levelsLevel ISubmental (IA) Submandibular (IB)Level IIUpper jugularLevel IIIMid jugularLevel IVLower jugularLevel VPosterior triangle group (Spinal accessory and transverse cervical chains)Level VIPrelaryngealPretrachealParatrachealLevel VIINodes of upper mediastinum", 'role': 'assistant'}]