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': 'Mucosa covering the Vermilion border of the lip is: \nSelect and explain. \nA. Keratinized mucosa., B. Specialized mucosa., C. Masticatory mucosa., D. Lining mucosa.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]