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': 'The commonest organism causing Empyema in a child under 2 years – \nSelect and explain. \nA. E.Coil, B. Staphylocccus, C. Pneumococcus, D. Klebsiella', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]