<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 5-month-old boy is brought to the physician by his mother because of poor weight gain and chronic diarrhea. He has had 3 episodes of otitis media since birth. Pregnancy and delivery were uncomplicated but his mother received no prenatal care. His immunizations are up-to-date. He is at the 10th percentile for height and 5th percentile for weight. Physical examination shows thick white plaques on the surface of his tongue that can be easily scraped off with a tongue blade. Administration of which of the following is most likely to have prevented this patients condition?? A: Fluconazole, B: Pencillin G, C: Zidovudine, D: Rifampin, E: Ganciclovir,  <response>: This is a clinical vignette describing a 5-month-old boy with poor weight gain, chronic diarrhea, recurrent otitis media, and oral thrush. The question asks which medication, if given prenatally to the mother, would most likely have prevented the childs current condition. The history of poor prenatal care for the mother, recurrent infections, failure to thrive, and oral thrush point towards an immunodeficiency disorder in the child. Oral thrush specifically suggests a defect in cell-mediated immunity. The choices list different antibiotics, antifungals, and antivirals. Of these, the one that would most likely prevent development of immunodeficiency if given prenatally is choice C, zidovudine AZT. AZT is used to prevent mother-to-child transmission of HIV during pregnancy. HIV infection leads to progressive cell-mediated immunodeficiency, which would explain this childs presentation.C: Zidovudine 