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
The commonest pre-malignant condition of oral cancer is 
Select and explain. 
A. Leukoplakia, B. Aphthous ulcer, C. Lichen planus, D. Erythro-leukoplakia
A: Leukoplakia
Answer: A: Leukoplakia 
Explanation: Leukoplakia is the most common (~ 85%) of the premalignant lesions of the oral cavity.