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': 'Primary consideration in any oral health preventive programme? \nSelect and explain. \nA. Fluoride application, B. Diet control, C. Plaque control, D. Pit & fissure sealant', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]