A child is sent to the school nurse because, according to his teacher, he's constantly scratching his head. When the nurse assesses his hair and scalp, she finds evidence of lice. What did she probably see ？（）
A．Flaking of the scalp with pink, irritated skin exposed.
B．Small white spots that adhere to the hair shaft, close to the scalp.
C．Scaly, circumscribed patches on the scalp, with mild alopecia in these areas.
D．Multiple tiny pustules on the scalp with no abnormal findings on the hair shafts.
参考答案：B
解析：
The small white spots that adhere to the hair shafts are the eggs, or nits, of lice. These are easy to see and can't be brushed off like dandruff. Flaking of the scalp may indicate dandruff or a dry scalp. Scaly patches and pustules, due to the scratching, may accompany a lice infestation, but nits would also be found on the hair shafts.
