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
True statement about antistreptolysin ‘O’ titre is : 
Select and explain. 
A. 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
B: In acute glomerulonephritis the titre is low
Answer: B: In acute glomerulonephritis the titre is low 
Explanation: ASO (Anti Streptolysin ‘O’) titre :
Estimation of antibody against streptolysin is a standard serological test for retrospective diagnosis of streptococcal infection
ASO titre > 200 are indicative of prior streptococcal infection
Raised after throat infection only
In acute glomerulonephritis the titre is low