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Which human worm infestation are we talking about?

I. In socio-economic impact on the human race, it is second only to Malaria.

II. The worm larva enters the human body by penetrating the skin

III. The worm requires snails as an intermediate host.

IV. In developing countries, it is a common cause of anaemia in children.

(1) Elephantiasis

(2) Bilharziasis

(3) Cysticercosis

(4) Plague