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': 'Ideal thickness of a free gingival graft obtained from the palate is \nSelect and explain. \nA. 0.5 - 1 mm, B. 1-1.5 mm, C. 1.5 - 2.0 mm, D. 2.0 - 2.5 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]