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': 'The length of junctional epithelium is: \nSelect and explain. \nA. 0.25 - 1.35 mm, B. 0.5 - .75 mm, C. 1.0 - 2.0 mm, D. 1.0 - 1.5 mm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]