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': 'Centre of air pollution control by WHO – \nSelect and explain. \nA. Hyderabad, B. Bombay, C. Nagpur, D. Kanpur', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]