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
Mucosa covering the Vermilion border of the lip is: 
Select and explain. 
A. Keratinized mucosa., B. Specialized mucosa., C. Masticatory mucosa., D. Lining mucosa.
A: Keratinized mucosa.
Answer: A: Keratinized mucosa. 
Explanation: None