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: Pathology
The main causative agent of Ludwig's angina is: 
Select and explain. 
A. Anaerobic streptococci, B. Aerobic streptococci, C. Staphylococci, D. Legionella infection
B: Aerobic streptococci
Answer: B: Aerobic streptococci 
Explanation: None