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': 'Most common site of squamous cell carcinoma: \nSelect and explain. \nA. Floor of the mouth, B. Tongue, C. Buccal mucosa, D. Lip', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lateral border of tongue is the most common site of squamous cell carcinoma.\nCarcinoma of the tongue accounts for more than 50% of intraoral cancers in the United States. Two-thirds of lingual carcinomas appear as painless, indurated masses or ulcers of the posterior lateral border; 20% occur on anterior lateral or ventral surfaces, and only 4% occur on the dorsum. For unknown reasons, the oral tongue represents an increasingly common site of involvement in young patients.', 'role': 'assistant'}]