<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 9-year-old girl is brought to the pediatrician by her mother who reports that the girl has been complaining of genital itching over the past few days. She states she has noticed her daughter scratching her buttocks and anus for the past week; however, now she is scratching her groin quite profusely as well. The mother notices that symptoms seem to be worse at night. The girl is otherwise healthy, is up to date on her vaccinations, and feels well. She was recently treated with amoxicillin for a middle ear infection. The child also had a recent bought of diarrhea that was profuse and watery that seems to be improving. Her temperature is 98.5F 36.9C, blood pressure is 11170 mmHg, pulse is 83min, respirations are 16min, and oxygen saturation is 98 on room air. Physical exam is notable for excoriations over the girls anus and near her vagina. Which of the following is the most likely infectious etiology?? A: Candida albicans, B: Enterobius vermicularis, C: Gardnerella vaginalis, D: Giardia lamblia, E: Herpes simplex virus,  <response>: Based on the description in the question stem, this 9-year-old girl has symptoms of genital itching and scratching of the buttocks, anus, and groin area. The itching is worse at night. She was recently treated with antibiotics for an ear infection and had diarrhea. Physical exam showed excoriations near her anus and vagina. The most likely infectious cause of genital itching and scratching, especially at night, in a prepubertal girl is pinworm infection caused by Enterobius vermicularis. Pinworms are common in children and cause perianal itching. The itching is often worse at night when the worms migrate to lay eggs around the anus. Her recent diarrhea and antibiotic use may have disrupted the normal gastrointestinal flora and allowed pinworms to proliferate. Candida albicans can cause vaginal itching but is less likely in a prepubertal girl. Gardnerella vaginalis causes bacterial vaginosis in sexually active women. Giardia lamblia can cause diarrhea but does not cause perianal itching. Herpes simplex virus can cause genital lesions but no lesions were described.B: Enterobius vermicularis 