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': 'Non keratinized areas in gingiva is/are: \nSelect and explain. \nA. Sulcular epithelium., B. Junctional epithelium., C. Interdental col., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]