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: Dental
[{'content': 'The epithelium which has only keratin layer, no nuclei is: \nSelect and explain. \nA. Parakeratinized epithelium., B. Nonkeratinized epithelium., C. Orthokeratinized epithelium., D. None of the Above.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Epithelium of Oral Mucosa', 'role': 'assistant'}]