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: Ans. is 'b' i.e., Staphylococcus", 'role': 'assistant'}]