Correct : English Grammar

The conclusion is that measures to control the mosquito population have failed. We need to identify the statement that, if true, does not contradict this conclusion.
Analyze the Options:
A) A high proportion of the affected population has returned from neighbouring countries where dengue is prevalent: This suggests that the increase in dengue cases may be due to people bringing the infection from other countries rather than mosquito-control measures failing. Therefore, it contradicts the conclusion.
B) More cases of dengue are now reported because of an increase in the Municipal Office’s administrative efficiency: This explains the increase as a result of better reporting rather than an actual increase in dengue cases. Therefore, it contradicts the conclusion.
C) Many more cases of dengue are being diagnosed this year since the introduction of a new and effective diagnostic test: This suggests that more cases are being detected because of the improved test, not because mosquito-control measures have failed. Therefore, it contradicts the conclusion.
D) The number of people with malarial fever has increased this year: Malaria is also spread through mosquito bites. An increase in malaria cases suggests that the mosquito population may still be high, supporting the conclusion that mosquito-control measures have failed.
Correct Answer: D) The number of people with malarial fever has increased this year.