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: Surgery
Cellulitis is caused by 
Select and explain. 
A. Beta hemolytic streptococci, B. Alpha hemolytic streptococci, C. Staphylococcus, D. All of the above
A: Beta hemolytic streptococci
Answer: A: Beta hemolytic streptococci 
Explanation: None