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
[{'content': 'Streptococcal Glomerulonephritis is best diagnosed by \nSelect and explain. \nA. ASO titre, B. AntiDNAse, C. Antihyaluronidase, D. Culture', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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", 'role': 'assistant'}]