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': 'Soiling index is measure for ? \nSelect and explain. \nA. Air pollution, B. Water pollution, C. Faecal contamination, D. Milk contamination', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Air pollution Monitoring of air pollution Monitoring of air pollution is done by : - Sulphur dioxide. Gritt and dust measurement. Co-efficient of haze. Air pollution index. Smoke or soiling index", 'role': 'assistant'}]