Explanation:
D
Wuchereria bancrofti is a parasite that infects the lymphatic glands and vessels of humans, and its embryo Microfilaria bancrofti, appears in the peripheral blood at night.
Manson (1877-79), who discovered this peculiar periodicity, presumed therefore that infections with this parasite are brought about through the intermediary of blood-sucking insects, which are active at night. On account of the habits of mosquitoes, it directed his attention to the relationship of these insects to the transmission of filariasis and fed Culex fatigans on the blood of heavily infected persons.
