<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3-day-old girl is brought to the general pediatrics clinic by her mother. She was the product of an uncomplicated, full-term, standard vaginal delivery after an uncomplicated pregnancy in which the mother received regular prenatal care. This morning, after changing the childs diaper, the mother noticed that the newborn had a whitish, non-purulent vaginal discharge. The mother has no other complaints, and the infant is eating and voiding appropriately. Vital signs are stable. Physical exam reveals moderate mammary enlargement and confirms the vaginal discharge. The remainder of the exam is unremarkable. What is the next step in management?? A: Order a karyotype, B: Begin a workup for 17 alpha-hydroxylase deficiency, C: Begin a workup for 21-hydroxylase deficiency, D: Begin a workup for 11 beta-hydroxylase deficiency, E: No tests are needed,  <response>: This is a question about the appropriate management of a newborn girl with vaginal discharge. The description indicates a healthy newborn girl with the only finding being a whitish, non-purulent vaginal discharge. This description is consistent with physiologic vaginal discharge in a newborn girl due to maternal estrogen exposure in utero. The question asks about the next step in management. A karyotype or endocrine workup would be unnecessary in an otherwise healthy newborn girl with an isolated finding of physiologic vaginal discharge. No specific tests or interventions are needed for this benign finding that will resolve on its own as the maternal estrogen clears.E: No tests are needed 