Dengue is transmitted by __________.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Aedes
Dengue is a viral fever spread by the bite of an infected Aedes mosquito, mainly Aedes aegypti (and also Aedes albopictus). Only the female bites, because she needs blood to develop her eggs. Aedes bites by day and breeds in clean, stagnant water collected in coolers, tyres, pots and tanks, so emptying such water is the main way to control dengue.
Why the other options are incorrect
Option (1) Culex — Incorrect. Culex spreads filariasis and Japanese encephalitis, not dengue.
Option (2) Male Anopheles — Incorrect. A male mosquito feeds on plant juices and does not bite, so it spreads no disease.
Option (4) Female Anopheles — Incorrect. The female Anopheles spreads malaria, not dengue.