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': 'Under the National Leprosy Elimination Programme, mass survey for leprosy is done if prevalence of leprosy is more than: \nSelect and explain. \nA. 1/1000, B. 5/1000, C. 10/1000, D. 20/1000', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Under the NLEP, mass surveys are carried out by house to house surveys if prevalence of leprosy is>10/1000. In mass surveys, not less than 95% of the population should be covered. Ref: Park 21st edition, page 295.', 'role': 'assistant'}]