[Head louse living on the ...] Which one of the following is categorized as a parasite in true sense?

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

The cuckoo lays its egg in crow's nest

The female Anopheles bites and sucks blood from humans

Human foetus developing inside the uterus draws nourishment from the mother

Head louse living on the human scalp as well as laying eggs on human hair

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