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
Regarding premalignant oral lesions True is 
Select and explain. 
A. 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
C: Erythroplakia has a higher risk for malignancy
Answer: C: Erythroplakia has a higher risk for malignancy 
Explanation: None