This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
Centre of air pollution control by WHO - 
Select and explain. 
A. Hyberabad, B. Bombay, C. Nagpur, D. Kanpur
C: Nagpur
Answer: C: Nagpur 
Explanation: International action : To deal with air pollution on a world-wide scale, the WHO has established an international network of laboratories for the monitoring and study of air pollution. The network consists of two international centres at London and Washington, three centres at Moscow, Nagpur and Tokyo and 20 laboratories in various pas of the world . These centres will issue warnings of air pollution where and when necessary Ref: Park 25th edition Pgno : 774