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
Most common organism implicated in causation of necrotizing fascitis: 
Select and explain. 
A. Staphylococcus aureus, B. Streptococcus pyogenes, C. Clostridium perfringens, D. Pneumococcus
B: Streptococcus pyogenes
Answer: B: Streptococcus pyogenes 
Explanation: Streptococcus pyogenes