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: Ans. is 'a' i.e., Leukoplakia Leukoplakia is the most common (-85%) of the premalignant lesions of the oral cavity.