The parents of a 5-year-old have just found out that their child has head lice. Which statement by the parents would support the nursing diagnosis of knowledge deficit?

Choice A rationale This statement reflects correct knowledge because head lice infestations, or pediculosis capitis, are highly contagious and spread through close contact or shared items, making it essential to check all household members to prevent reinfestation and ensure effective eradication of the parasites. Choice B rationale This statement supports a nursing diagnosis of knowledge deficit because it indicates a misconception that head lice are associated only with poor hygiene or low socioeconomic status, when in fact, lice infestation is unrelated to cleanliness and can occur in any population group through head-to-head contact. Choice C rationale This statement demonstrates correct knowledge because itching, particularly around the ears, neck, and scalp, is a common clinical manifestation of pediculosis capitis, caused by the louse saliva irritating the scalp, thus the parent correctly links the symptom to the new diagnosis. Choice D rationale This statement shows correct understanding of treatment because the nit comb is crucial for manually removing nits (lice eggs) that may remain attached to the hair shaft even after chemical pediculicide treatment, which often only kills live lice but not all the eggs.