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
A 45-year-old male patient complains of non-healing oral ulcer since a month over the lateral border of the tongue, on histologic examination abnormal keratinization is seen, what can be the possible diagnosis: 
Select and explain. 
A. BCC, B. SCC., C. Keratoacanthoma., D. Erthyroplakia.
B: SCC.
Answer: B: SCC. 
Explanation: None