The correct option is D Culex - Filariasis
Yellow fever is an acute viral disease and it primarily spreads by mosquitoes of Aedes aegypti species.
Kala-azar or leishmaniasis is a disease caused by protozoan parasites of the Leishmania genus.
Amoebic dysentery is a type of dysentery caused by the amoeba, Entamoeba histolytica.
Culex is the genus of mosquitoes and serves as vectors and filariasis is one such disease for which Culex is the vector.
So, the correct answer is option D.