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': 'Normal depth of gingival Sulcus in adult does not exceed \nSelect and explain. \nA. 0.5 - 1mm, B. 2 -3 mm, C. 1-2 mm, D. 1 - 3 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]