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': 'Given Condition is due to a defect in the normal keratinization of the oral mucosa: \nSelect and explain. \nA. White sponge Nevus., B. Erythema multiformae., C. Incontinentia pigmenti., D. Systemic sclerosis.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]