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': 'The highest frequency of palpable metastasis in neck on presentation is - \nSelect and explain. \nA. Carcinoma tongue, B. Buccal mucosa, C. Alveolus, D. Lip', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "Among oral cavity cancers, cancers of the mobile tongue have a high incidence of occult and clinical cervical lymph node metastasis".\n─ Head & Neck surgery : otolaryngology', 'role': 'assistant'}]