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: Dental
Bacteria most commonly isolated from root canals is 
Select and explain. 
A. Actinomyces, B. Streptococci, C. Staphylococci, D. Fusobacterium
B: Streptococci
Answer: B: Streptococci 
Explanation: None