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': 'Secondary peripheral seal area in mandible is provided by: \nSelect and explain. \nA. Buccal shelf, B. Anterior lingual border, C. Retromolar pad, D. Crest of the ridge', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]