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': 'Metastasis of ca buccal mucosa goes to \nSelect and explain. \nA. Hea, B. Brain, C. Regional lymph node, D. Lungs', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tumors in this area have a propensity to spread locally and to metastasize to regional lymphatics . Lymphatic metastasis of Buccal ca go to submandibular and later upper jugular nodes. MC type of Buccal ca - Squamous cell ca Commonest site of origin - angle of mouth or the line of occlusion of upper and lower teeth', 'role': 'assistant'}]