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
In which the following head and neck cancers, is lymph node metastasis least common 
Select and explain. 
A. Tongue, B. Buccal mucosa, C. Hard palate, D. Lower alveolus
C: Hard palate
Answer: C: Hard palate 
Explanation: 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,