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: ENT
The most common pre-malignant condition of oral carcinoma is - 
Select and explain. 
A. Leukoplakia, B. Erythroplakia, C. Lichen planus, D. Fibrosis
A: Leukoplakia
Answer: A: Leukoplakia 
Explanation: Two important premalignant lesions for oral cancer are : -


Leukoplakia
Erythroplakia


Leukoplakia is the most common premalignant lesions.
But, the risk of malignant transformation of erythroplakia is much higher than that seen with leukoplakia.
The most common predisposing factor for both these conditions is smoking.