Filariasis is caused by.

Correct Option: C

Explanation:

• Filariasis is a parasitic illness caused by Wuchereria bancrofti.
• Blood-feeding insect vectors propagate the illness. Filariasis may produce symptoms in the lymphatics, skin, and eyes as a result of frequent and long-term exposure to these vectors.
• Pathogenesis occurs when a vector bites a human and releases the larva into the skin, where it subsequently travels to the lymph vessels.
• The larva develops into the adult worm in the lymphatics, where it can live for several years.
• The mature female worm then discharges a large number of microfilariae into the bloodstream.
• Microfilariae are found in the deep vascular bed during the day, but move to the peripheral circulation at night. When a mosquito feeds on this blood and attacks a healthy person at night, the cycle is repeated in that person as well.

Hence, Filariasis is caused by Microfilariae.