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': 'Long connective tissue papillae and keratinized epithelia are a feature of these parts of oral mucosa \nSelect and explain. \nA. gingiva and alveolar mucosa, B. hard palate and gingiva, C. buccal and alveolar mucosa, D. hard and soft palate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]