This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Streptococcal Glomerulonephritis is best diagnosed by 
Select and explain. 
A. ASO titre, B. AntiDNAse, C. Antihyaluronidase, D. Culture
B: AntiDNAse
Answer: B: AntiDNAse 
Explanation: In rheumatic fever and glomerulonephritis, the retrospective diagnosis of streptococcal infection may be established by demonstrating a high level of antibody to streptococcal toxins. Antideoxyribonuclease B titers higher than 300 are taken as significant. It is useful in the retrospective diagnosis of streptococcal pyoderma, in which ASO titer is of much less value. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 214