<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 26-year-old woman, gravida 2, para 1, at 9 weeks gestation comes to the physician with her 16-month-old son for her first prenatal visit. Her son has had low-grade fever, headache, and arthralgia for 5 days. He has also had a generalized rash that started on the cheeks 2 days ago and has since spread to his body. The woman has some mild nausea but is feeling well. Her first pregnancy was uneventful. Her son was delivered at 40 weeks gestation via lower segment transverse cesarean section because of a nonreassuring fetal heart rate. Current medications include prenatal vitamins with folic acid. Preconception rubella and varicella titers were recorded as adequate. His immunizations are up-to-date. His temperature is 36.8C 98.2F, pulse is 85min, respirations are 13min, and blood pressure is 11465 mm Hg. Pelvic examination of the woman shows a uterus consistent in size with a 9-week gestation. An image of the womans son is shown. A complete blood cell count is within normal limits. Which of the following is the most appropriate next step in management?? A: Report the disease to health authorities, B: Maternal serologic assays for virus-specific IgG and IgM, C: Antibiotics for the child, D: Serial fetal ultrasounds, E: Isolation precautions for the child,  <response>: This is a question about the appropriate management of a pregnant woman whose young child has symptoms and signs consistent with a viral exanthem. The key findings in the child are low-grade fever, headache, arthralgia, and a generalized rash starting on the cheeks and spreading to the body. This presentation is most consistent with rubella infection. In a pregnant woman, rubella infection can lead to congenital rubella syndrome in the fetus. Therefore, the next step should be to check the womans serologic status to see if she is immune to rubella or if she has contracted the infection from her child. Choice B, checking maternal serologic assays for virus-specific IgG and IgM, is the best answer.Choice A, reporting the disease, may be appropriate at some point but is premature before confirming the diagnosis and assessing the womans immune status. Choices C and E related to treating the child are not the immediate priority. Choice D, serial fetal ultrasounds, may be indicated later if the woman is diagnosed with acute rubella infection, but the first step is maternal serologic testing.B: Maternal serologic assays for virus-specific IgG and IgM 