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: Pathology
Which of following is an oral precancer? 
Select and explain. 
A. Oral hairy Leukoplakia, B. White spongy naevus, C. Leukemia, D. Speckled Leukoplakia
D: Speckled Leukoplakia
Answer: D: Speckled Leukoplakia 
Explanation: None