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: Microbiology
[{'content': 'Eaton agent is - \nSelect and explain. \nA. Chlamydia, B. Mycoplasma pneumoniae, C. Klebsiella, D. H. influenzae', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Mycoplasma pneumoniae", 'role': 'assistant'}]