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': 'Proper lip support for complete denture is provided primarily by: \nSelect and explain. \nA. Convex surface of labial flange, B. Facial surface of teeth and simulated gingiva, C. Thickness of border in the vestibule, D. Festooned carvings on facial surface', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Proclination of maxillary anterior teeth and the surrounding denture base simulating the gingiva provided for the bulk for lip support in complete denture.', 'role': 'assistant'}]