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Which one of the following is categorise...

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

A

The cuckoo (koel) lays its egg in crow’s nest

B

The female Anopheles bites and sucks blood from humans

C

Human foetus developing inside the uterus draws nourishment from the mother

D

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

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