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The number of people diagnosed with dengue fever ( which is contacted from the bite of an infected mosquito ) in Bangladesh this year is twice the number diagnosed last year . The authorities have concluded that measures to control the mosquito population have failed in the region. All of the following , if true , would cast doubt on the authorities' conclusion EXCEPT-

A. More case are now reported because of increased administrative efficiency
B. A more effective diagnostic test was introduced about nine month ago
C. The disease is prevalent only in some industrialised areas which have shown a dramatic increase in population due to migration
D. The incidents (number of cases per thousand) of malaria, also contacted from mosquito bites has increased
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সঠিক উত্তরঃ D. The incidents (number of cases per thousand) of malaria, also contacted from mosquito bites has increased
Explanation:
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