The correct answer is B. Mosquito.
Filariasis is a parasitic disease caused by nematodes of the genus Wuchereria, Brugia, and Onchocerca. It is transmitted to humans through the bite of infected mosquitoes. The parasites live in the lymphatic system, causing inflammation and swelling of the lymph nodes, lymphedema, and elephantiasis.
Protozoa are single-celled organisms that can cause a variety of diseases, including malaria, toxoplasmosis, and giardiasis. However, they are not the cause of filariasis.
Viruses are also single-celled organisms, but they are much smaller than protozoa. They cannot replicate on their own, and they require a host cell to reproduce. Viruses can cause a variety of diseases, including the common cold, the flu, and HIV/AIDS. However, they are not the cause of filariasis.
Bacteria are single-celled organisms that can cause a variety of diseases, including pneumonia, strep throat, and tuberculosis. However, they are not the cause of filariasis.
Mosquitoes are insects that transmit a variety of diseases, including malaria, dengue fever, and yellow fever. They are also the vector for filariasis. Mosquitoes bite humans and inject saliva into the wound. The saliva contains filarial larvae, which travel through the bloodstream to the lymphatic system. The larvae mature into adult worms, which live in the lymphatic system and produce more larvae. The larvae are then transmitted to other people through mosquito bites.
Filariasis is a serious disease that can cause a variety of health problems, including lymphedema, elephantiasis, and hydrocele. There is no cure for filariasis, but it can be treated with medication. Treatment can kill the adult worms and prevent the production of new larvae. However, it cannot remove the dead worms from the body. This can lead to long-term health problems.
There is no vaccine for filariasis. The best way to prevent filariasis is to avoid mosquito bites. This can be done by using insect repellent, wearing long-sleeved shirts and pants, and using mosquito nets.