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: Pathology
[{'content': 'The most common site for metastasis from carcinoma of cheek: \nSelect and explain. \nA. Brain, B. Regional lymph nodes, C. Lung, D. Liver', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]