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: Pediatrics
[{'content': 'Neonatal septicemia is most commonly caused by ? \nSelect and explain. \nA. Group B Streptococci, B. E.coli, C. Streptococcus viridans, D. Staphylococcus aureus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Group B streptococci", 'role': 'assistant'}]