The human liver fluke depends on two intermediate hosts to complete its life cycle. Identify the names of these hosts.

Elephantiasis (filariasis) is caused by which worm?

Assertion $A$: In elephantiasis, body parts like legs, arms, and genital organs swell significantly.
Reason $R$: In chronic cases, filarial worms block the lymphatic vessels.
Which option is correct for Assertion $A$ and Reason $R$?

In which disease does chronic inflammation of the lymphatic vessels occur?

Assertion : Tapeworm,roundworm and pinworm are endoparasites of human intestine.
Reason : Improperly cooked food is the source of intestinal infections.

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