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 threshold dose of fluoride that requires immediate emergency treatment and hospitalization in acute fluoride toxicity is: \nSelect and explain. \nA. 4mg, B. 5mg, C. 6mg, D. 7mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]