<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A previously healthy 3-week-old infant is brought to the emergency department 6 hours after the onset of fever and persistent irritability. He had been well until 2 days ago, when he started feeding poorly and sleeping more than usual. He appears lethargic and irritable when roused for examination. His temperature is 39C 102F. He cries when he is picked up and when his neck is flexed. The remainder of the physical and neurological examinations show no other abnormalities. His serum glucose is 115 mgmL. His total serum bilirubin is 6.3 mgdL. Cerebrospinal fluid analysis shows:Pressure 255 mm H2OErythrocytes 2mm3Leukocyte count 710mm3Segmented neutrophils 95Lymphocytes 5Protein 86 mgdLGlucose 22 mgdLGram stain results of the cerebrospinal fluid are pending. Which of the following is the most appropriate initial antibiotic regimen for this patient?? A: Ampicillin and ceftriaxone, B: Gentamicin and cefotaxime, C: Ampicillin, gentamicin, and cefotaxime, D: Vancomycin, ampicillin, and cefotaxime, E: Vancomycin, ampicillin, and doxycycline,  <response>: This is a question about choosing an appropriate initial antibiotic regimen for a 3-week-old infant with suspected bacterial meningitis based on the clinical presentation and cerebrospinal fluid analysis. The key findings are the infants age, fever, irritability, neck stiffness, CSF pleocytosis with neutrophil predominance, and hypoglycorrhachia, which are consistent with bacterial meningitis. The goal is to provide broad-spectrum empiric coverage for the most likely organisms that cause bacterial meningitis in this age group, including group B streptococcus, Escherichia coli, Listeria monocytogenes, and Streptococcus pneumoniae. C: Ampicillin, gentamicin, and cefotaxime 