This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Pediatrics
A forceps delivered premature baby develops fever, abnormal behavior, bulging fontanelle 5 days after bih. What is the likely causative organism? 
Select and explain. 
A. Neisseria meningitidis, B. Listeria monocytogenes, C. Staph aureus, D. Pneumococcus
B: Listeria monocytogenes
Answer: B: Listeria monocytogenes 
Explanation: Given scenario suggests diagnosis of Meningitis Neonatal Listeriosis 2 clinical presentations are recognized: EARLY ONSET (<5 DAYS ) LATE ONSET (>=5 DAYS) Positive result of maternal Listeria culture Obstetric complications Premature delivery Low bihweight Neonatal sepsis Negative result of maternal Listeria Culture Uncomplicated pregnancy Term delivery Normal bihweight Neonatal meningitis