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': 'True regarding fluorosis are all except – \nSelect and explain. \nA. Fluorosis is the most common cause of dental caries in children, B. Fluorosis can cause fluoride deposition in bones, C. Defluoridation is done by Nalgonda technique, D. Fluorosis can cause genu valgum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]