Chenopodium oil is used in the treatment of:

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 $R$?

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

Explain the disease Elephantiasis.

Which of the following is a helminth disease?

Ascariasis is caused by an endoparasite of human $...A...$ commonly called $...B...$ Here $A$ and $B$ refer to: