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
Organism involved in cellulitis is: 
Select and explain. 
A. Strept. mutans, B. Strept, pyogenes, C. Pneurnococci, D. Klebsiella
B: Strept, pyogenes
Answer: B: Strept, pyogenes 
Explanation: None