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: Social & Preventive Medicine
[{'content': 'Fluoride helps in \nSelect and explain. \nA. Vision, B. Dentition, C. Myelinaon, D. Joint stability', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fluoride helps in denon and reduces tooth decay,\n\nFlourine is oen called a two edged sword\n\n\nExcess intake →Causes Endemic fluorosis\nInadequate →Causes dental caries', 'role': 'assistant'}]