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': 'Which of the following has highest malignant transformation rate: \nSelect and explain. \nA. Erythroplakia., B. Proliferative Verrucous leukoplakia, C. Speckled leukoplakia., D. Homogenous leukoplakia.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]