$Wuchereria bancrofti$ is carried by:

Which of the following is a metazoan parasite transmitted through contaminated food or water?

Assertion $A$: Elephantiasis is a fatal disease.
Reason $R$: Filarial worms reside in the lymphatic vessels and lymph nodes.
Which option is correct for Assertion $A$ and Reason $R$?

$Wuchereria bancrofti$ is:

Through which route do the infective larvae of the filarial worm enter a new host?

Infection of $Ascaris$ usually occurs by