<prompt> In which of the following head and neck cancers, is lymph node metastasis least common:TongueBuccal mucosaHard palateLower alveolus  <response>: Ans. is c i.e. Hard palate Incidence of cervical metastasis in head and neck cancers in decreasing orderTongue most commonFloor of mouthLower alveolusBuccal mucosaUpper alveolusHard palate 