The term 'nits' refers to what in lice biology?

• A. A larval protozoan
• B. Eggs of lice
• C. Cocoons of fleas
• D. A type of pentastomid

Answer: (B)

In lice biology, a nit refers to the egg laid by a female louse and attached to a hair shaft near the scalp. The egg is cemented to the hair so it’s not easily brushed away, and it hatches into a nymph, which then becomes an adult. The empty egg casings that remain after hatching (the nits) can cling to the hair for some time. This term specifically denotes the lice egg, not a larval protozoan, not a flea cocoon, and not a pentastomid. Understanding that distinction helps in identifying infestations, since nits are located close to the scalp and are a sign of ongoing lice reproduction.