This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'A patient in the post opreative ICU with intravenous catheter developed spikes of fever.The causativeorvanism is - \nSelect and explain. \nA. E. Coli, B. Coagulase negative staphylococci, C. Pseudomonas, D. Streptococcus agalactiae', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]