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 distance between the gingiva and the margin of the free end of the stainless steel crown should be: \nSelect and explain. \nA. 0.5 mm below, B. 0.5-1.0 mm below, C. 0.5 mm above, D. 0.5- 1.0 mm above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The stainless steel crown should be approximately 0.5 to 1 mm beneath the free margin of the gingival tissue.', 'role': 'assistant'}]