This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology Pa 1 (Gram Positive Cocci, Gram Negative Cocci), Subject name: Microbiology
3-year-old girl with a history of hydrocephalus, c/o severe headache and fever. The girl underwent a revision of a ventricular-peritoneal shunt 1 month ago, and the neurologist suspects an infection . Which of the following organisms would most likely be isolated from the shunt tubing? 
Select and explain. 
A. Bacteroides fragilis, B. Corynebacterium diphtheriae, C. Escherichia coli, D. Staphylococcus epidermidis
D: Staphylococcus epidermidis
Answer: D: Staphylococcus epidermidis 
Explanation: Staphylococcus epidermidis is the most likely organism to be isolated from shunt tubing . Staphylococcus epidermidis CONS which is less pathogenic but it also cause infection in case of an intervention Produces biofilms - adhere to the surface of shunts with the help of these biofilm Novobiocin sensitive