Which disease is transmitted by Anopheles quadrimaculatus?

Anopheles quadrimaculatus is a species of mosquito that is a well-known vector for malaria. This mosquito specializes in feeding on humans and is particularly effective in transmitting the malaria parasite, Plasmodium, from one host to another.

Malaria is caused by several parasite species, primarily Plasmodium falciparum, P. vivax, P. ovale, and P. malariae, all of which are transmitted when an infected female Anopheles mosquito bites a person. The lifecycle of the malaria parasite involves both the mosquito and the human host, with the mosquito acting as the crucial link in spreading the disease.

The other diseases listed are transmitted by different vectors or mechanisms. Chikungunya is transmitted by Aedes mosquitoes, West Nile Virus is primarily spread by Culex mosquitoes, and Eastern Equine Encephalitis is also transmitted mainly by Culiseta and Aedes mosquitoes. Thus, the specificity of Anopheles quadrimaculatus in transmitting malaria makes it the correct answer.