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': 'One of the following group of fibers in the lamina propria of the gingiva, help to bind the free gingiva to the tooth \nSelect and explain. \nA. Alveologingival, B. Circular, C. Dentoperiosteal, D. Dentogingival', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]