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': 'How many mobile dental units are proposed at the district level covering a population of 45,000 - 5,00,000 ? \nSelect and explain. \nA. 1, B. 3-Feb, C. 4-Mar, D. 7-Jun', 'role': 'user'}, {'content': 'Answer: C \nExplanation: National Oral Health Programme (NOHP) was undertaken to improve oral health because oral health is the basic expectation of all Indians. Oral health is the most basic human needs. NOHP assess needs, monitors outcomes, decreases disparities, improves access to care and ultimately improves oral health.', 'role': 'assistant'}]