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': 'Under normal condition amount of fluoride secreted from the gland in the mouth: \nSelect and explain. \nA. 0.007-0.05ppm, B. 0.005-0.007ppm, C. 0.07-0.05ppm, D. None.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]