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Which one of the following is categorised as a parasite in true sense?

(a) Human foetus developing inside the uterus draws nourishment from the mother

(b) House louse living on the human scalp as well as laying eggs on human air

(c) The cuckoo (koel) lays its eggs in crow's nest.

(d) The female Anopheles bites and sucks blood from humans.

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