This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'In which the following head and neck cancers, is lymph node metastasis least common \nSelect and explain. \nA. Tongue, B. Buccal mucosa, C. Hard palate, D. Lower alveolus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: LN metastasis is most common in : CA tongue >Floor of mouth > Lower alvealus >Buccal mucosa > Upper Alveolus > Hard palate > lip Ref: Bailey and love 27th edition Pgno : 764-765,', 'role': 'assistant'}]