Match the pairs of diseases and pathogens:
`{:("Column-I","Column-II"),(1." Malaria", a." Wuchereria bancrofti"),(2." Filariasis", b." Helminth"),(3." Typhoid", c." Plasmodium falciparum"),(4." Schistosomiasis", d." Salmonella typhi"):}`
A. 1-c,b-b,3-a,4-d
B. 1-d,2-a,3-b,4-c
C. 1-a,2-a,3-c,4-d
D. 1-c,2-a,3-d,4-b
