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': 'If in a locality API is more than 2, the folloiwng is done- \nSelect and explain. \nA. 2 round of DDT per year with active surveillance, B. 2 rounds of DDT per year with active and passive surveillance, C. Only active and passive surveillance, D. 2 rounds of DDT per year only', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 2 rounds of DDT per year with active and passive surveillance", 'role': 'assistant'}]