question: Q:A 3-day-old boy is brought to the physician by his mother because of irritability and feeding intolerance for 1 day. His temperature is 39.2°C (102.6°F). Physical examination shows a bulging anterior fontanelle. A photomicrograph of a Gram stain of the cerebrospinal fluid is shown. Further evaluation shows that the organism expresses the K1 capsular polysaccharide. Which of the following is the most likely causal pathogen?? 
  {'A': 'Escherichia coli', 'B': 'Listeria monocytogenes', 'C': 'Pseudomonas aeruginosa', 'D': 'Salmonella typhi', 'E': 'Streptococcus agalactiae'},