Which mosquito species is not a dengue vector?

• A. Aedes aegypti
• B. Aedes albopictus
• C. Culex pipiens
• D. Anopheles gambiae

Answer: (C)

Dengue virus is transmitted mainly by mosquitoes in the Aedes genus, especially Aedes aegypti and Aedes albopictus. These species bite humans readily and breed in urban, container-based habitats, which makes them efficient dengue vectors. Culex pipiens is not a dengue vector; Culex species are associated with other pathogens like West Nile virus and do not efficiently transmit dengue. Anopheles gambiae is the malaria vector and likewise does not play a role in dengue transmission. So, among the options, Culex pipiens is not a dengue vector.