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

Options

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 lying eggs on human hair

Answer

D

Explanation

A parasitism is the relationship between two organism where one benefit at the expense of other. Louse is a human parasite living on human scalp and lay eggs on human hair.