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: ENT
[{'content': 'In carcinoma of lower lip secondaries are seen in - \nSelect and explain. \nA. Upper cervical LN, B. Supra clavicular LN, C. Axillary LN, D. Mediastinal LN', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Submental and submandibular nodes are involved first in carcinoma of lips.\nSubmental and submandibular are included in upper cervical LN or level 1\xa0lymph nodes.', 'role': 'assistant'}]