<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: 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.
Options:
A. Lymphoma
B. Squamous cell carcinoma
C. Metastatic skin cancer
D. Benign mixed tumor
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is B: Squamous cell carcinoma. Explanation: The tip of the tongue drains into the submental lymph nodes, whereas, the side of the tongue drains into the submandibular lymph nodes.<|im_end|>
