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
[{'content': '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: \nSelect and explain. \nA. BCC, B. SCC., C. Keratoacanthoma., D. Erthyroplakia.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]