<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old G1P0 woman at 16 weeks estimated gestational age presents for prenatal care. Routine prenatal screening tests are performed and reveal a positive HIV antibody test. The patient is extremely concerned about the possible transmission of HIV to her baby and wants to have the baby tested as soon as possible after delivery. Which of the following would be the most appropriate diagnostic test to address this patients concern?? A: EIA for HIV antibody, B: Antigen assay for p24, C: Viral culture, D: CD4 T cell count, E: Polymerase chain reaction PCR for HIV RNA,  <response>: This question is asking about the most appropriate diagnostic test to detect HIV infection in a newborn baby. The mother is HIV positive, so the concern is testing the baby after delivery to see if the virus was transmitted vertically during pregnancydelivery. Choice A tests for HIV antibodies, which would reflect the mothers status rather than the babys, since antibodies cross the placenta. Choice B tests for the p24 antigen, which appears early in HIV infection but can have false negatives in newborns. Choice C tests for presence of the virus itself via culture, but has a long turnaround time. Choice D tests CD4 count which is not useful for diagnosing HIV itself. Choice E, PCR for HIV RNA, is the best test because it directly detects the presence of the virus itself in the babys blood and can give rapid results. PCR is the preferred diagnostic test for HIV infection in newborns.E: Polymerase chain reaction PCR for HIV RNA 