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: Unknown
[{'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. It is poorly antigenic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ASO (Anti Streptolysin ‘O’) titre :\nEstimation of antibody against streptolysin is a standard serological test for retrospective diagnosis of streptococcal infection\nASO titre > 200 are indicative of prior streptococcal infection\nRaised after throat infection only\nIn acute glomerulonephritis the titre is low', 'role': 'assistant'}]