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
Centre of air pollution control by WHO ? 
Select and explain. 
A. Hyderabad, B. Bombay, C. Nagpur, D. Kanpur
C: Nagpur
Answer: C: Nagpur 
Explanation: Ans. is 'c' i.e., Nagpur