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: Surgery
[{'content': 'Regarding premalignant oral lesions True is \nSelect and explain. \nA. Leukoplakia should be proved by biopsy, B. Leukoplakia dose not disappear after cassation of smoking, C. Erythroplakia has a higher risk for malignancy, D. Oral submucous fibrosis is seen in all parts of the world', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]