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: Surgery
[{'content': 'Metastasis of ca buccal mucosa goes to ? \nSelect and explain. \nA. Regional lymph node, B. Liver, C. Hea, D. Brain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans is \'a\' ie Regional lymph nodes "Tumors in this area have a propensity to spread locally and to metastasize to regional lymphatics."- Schwaz Also know Lymphatic metastasis of Buccal ca go to submandibular and later upper jugular nodes. - Dhingra 4/e 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 (Dhingra)', 'role': 'assistant'}]