This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: Surgery
[{'content': "A 63-year-old bartender presents at his physician's office complaining of a painful sore on his tongue. On examination, it is found that he has an ulcerated lesion on his tongue and a mass in the submandibular gland triangle. What is the most likely diagnosis? SELECT ONE. \nSelect and explain. \nA. Lymphoma, B. Squamous cell carcinoma, C. Metastatic skin cancer, D. Benign mixed tumor", 'role': 'user'}, {'content': 'Answer: B \nExplanation: The tip of the tongue drains into the submental lymph nodes, whereas, the side of the tongue drains into the submandibular lymph nodes.', 'role': 'assistant'}]