This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hydrocephalus, Subject name: Pediatrics
Most common cause of shunt infection following a Ventriculo-Peritoneal shunt is: 
Select and explain. 
A. Staph aureus, B. Staph epidermidis, C. Strepto viridans, D. Strepto pneumoniae
B: Staph epidermidis
Answer: B: Staph epidermidis 
Explanation: V-P Shunt: Medical device that relieves pressure on the brain by draining the extra CSF from brain into peritoneum. Used to treat Hydrocephalus Major complications of V-P shunt: Occlusion --> characterized by headache, papilledema, emesis, mental status changes. Bacterial infection --> characterized by fever, headache, meningismus. MCC --> Staph epidermidis