This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Social & Preventive Medicine
[{'content': 'Indicator of air pollution are: \nSelect and explain. \nA. Sulphur dioxide, lead, paiculate matter, B. Carbon dioxide, hydrogen sulphide, lead, C. Sulphur dioxide, hydrogen sulphide, carbon monoxide, D. Sulphur dioxide, smoke, paiculate matter', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The best indicators of air pollution aresulphur dioxide, smoke and suspended paicles. These are monitored on a daily basis over several sites, results often collected by a central agency. Air pollution indicators are- CO2, CO SO2, NO2 Air pollution index Soiling index Coefficient of haze Suspended paiculate matter', 'role': 'assistant'}]