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': "True statement about Antistreptolysin 'O' titre is - \nSelect and explain. \nA. In normal people the titre is < 200, B. In acute glomerulonephritis the titre is low, C. ASO titre > 200 indicate rheumatic fever, D. Streptozyme test is an active haemagglutination test", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]