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: Microbiology
A 30 year old female is on antibiotics with prolonged IV cannulation, has spike of fever, the likely cause is : 
Select and explain. 
A. Pseudomonas aerugenosa, B. Coagulase negative staphylococcus, C. Streptococcus agalactiae, D. E. coli
B: Coagulase negative staphylococcus
Answer: B: Coagulase negative staphylococcus 
Explanation: Staph. epidermidis is MC cause of infection on implanted foreign bodies.