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
Streptococcal glomerulonephritis is best diagnosed by: 
Select and explain. 
A. ASO titre, B. Anti DNAse, C. Hyaluronidase, D. Culture
B: Anti DNAse
Answer: B: Anti DNAse 
Explanation: In streptococcal glomerulonephritis, ASO titre is often low. So, retrospective diagnosis is made by anti DNAase and antihyaluronidase.