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': 'Leukoplakia with the worst prognosis is seen on the: \nSelect and explain. \nA. Dorsum of tongue, B. Floor of mouth, C. Buccal mucosa, D. Palate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]