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. Heart, D. Brain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "Tumors in this area have a propensity to spread locally and to metastasize to regional lymphatics."- Schwartz\nAlso know\n\nLymphatic metastasis of Buccal ca go to submandibular and later upper jugular nodes. - Dhingra 4/e\nMC type of Buccal ca → Squamous cell ca\nCommonest site of origin → angle of mouth or the line of occlusion of upper and lower teeth (Dhingra)', 'role': 'assistant'}]