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: Surgery
[{'content': 'Diagnostic criteria for blood stream infection from central venous catheter includes all except? \nSelect and explain. \nA. Colony count from catheter culture is 5 times more than peripheral blood culture, B. Blood culture form catheter shows colony formation at least 2 hours before the peripheral blood culture, C. Quantitative catheter tip culture showing >103 CFU/ catheter segment whereby the same organism is isolated from the catheter segment and a peripheral blood sample, D. Apparent source of blood stream infection present', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. Apparent source of blood stream infection presentIt is defined as the presence of bacteremia originating frorn an intravenous catheter.The most comlnon cause of nosocomial bacteremia.Laboratory diagnosis-CRBSI means a patient with an intravascular catheter has at least one positive blood culture obtained from a peripheralvein, clinical manifestations of infections.Long-term catheters-Semi-quantitative growth of 15 cfu/catheter segment of the same microbe from both the inseion site culture, and the catheter hub culture strongly suggests that the catheter is the source ofa bloodstream infection.', 'role': 'assistant'}]