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': 'Dentogingival unit comprises of \nSelect and explain. \nA. Gingival fibres, B. Gingival fibres and junctional epithelium, C. P.D. fibres and ligament, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]