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': 'Thayer Main medium is used for ? \nSelect and explain. \nA. Legionella, B. Meningococcus, C. Pneumococcus, D. Mycoplasma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Meningococcus", 'role': 'assistant'}]