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': 'A reliable guide for positioning maxillary anterior teeth\nis complete dentures is \nSelect and explain. \nA. Fovea palatine, B. Incisive papillae, C. Maxillary ridge, D. Rugae', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]