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
Necrotizing fasciitis is caused by - 
Select and explain. 
A. Staphylococcus aureus, B. Beta hemolytic streptococci, C. Clostridium perfringens, D. Pneumococcus
B: Beta hemolytic streptococci
Answer: B: Beta hemolytic streptococci 
Explanation: None