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 minimum thickness of an alginate impression material should be \nSelect and explain. \nA. 8 mm, B. 3 mm, C. 6 mm, D. 5 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]