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
If API>2, the vector is resistant to DDT, the malathion spray should be done every 
Select and explain. 
A. 3 round of malathion every 3 months, B. 2 round or malathion every months, C. 1 -2 round of malathion every 3 months, D. One round of malathion every month
A: 3 round of malathion every 3 months
Answer: A: 3 round of malathion every 3 months 
Explanation: None