<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:Blood cultures are sent to the laboratory and empiric treatment with intravenous vancomycin is started. Blood cultures grow gram-negative bacilli identified as Cardiobacterium hominis. Which of the following is the most appropriate next step in management?? A: Switch to intravenous ampicillin, B: Switch to intravenous ceftriaxone, C: Switch to intravenous cefazolin, D: Switch to intravenous gentamicin, E: Add intravenous rifampin,  <response>: This is a question about the appropriate antibiotic treatment for a bloodstream infection caused by Cardiobacterium hominis. The patient was initially started on vancomycin, which covers gram positive organisms but not gram negatives like C. hominis. We need to switch to an antibiotic that covers this gram negative organism. Ampicillin and cefazolin have poor coverage for C. hominis. Ceftriaxone has good coverage for this organism. Gentamicin could potentially be used but has a higher risk of toxicity. Adding rifampin provides additional coverage but is not needed as a single agent.B: Switch to intravenous ceftriaxone 