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: ENT
[{'content': 'Not included in oral cavity Ca -a) Base of tongueb) Gingivobuccal sulcusc) Soft palated) Hard palatee) Buccal mucosa \nSelect and explain. \nA. a, B. bc, C. ad, D. ac', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The vermilion border of the lips is the anterior boundary of the oral cavity, while the anterior tonsillar pillars, the posterior aspect of the hard palate, and the circumvallate papillae of the tongue are the posterior boundary.\nSubsites are : -\n\n\nThe vermilion surfaces of the lips.\nThe alveolar process of the mandible.\nThe alveolar process of the maxilla.\nThe retromolar trigone, which is the mucosa overlying the ascending ramus of the mandible behind the last lower molar tooth.\nThe hard palate.\nThe buccal musoca, which lines the cheeks and inner aspects of the lips and includes the upper and lower buccoalveolar gutters.\nThe floor of the mouth.\nThe anterior two-third of the tongue (oral tongue), which is limited posteriorly by the circumvallate papillae and includes the tip, dorsum, lateral borders, and undersurface of the oral tongue.', 'role': 'assistant'}]