This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
The commonest organism causing cellulitis is 
Select and explain. 
A. Streptococcus pyogenes, B. Streptococcus faecalis, C. Streptococcus viridans, D. Microaerophilic streptococci
A: Streptococcus pyogenes
Answer: A: Streptococcus pyogenes 
Explanation: Streptococcus pyogenes causes a variety of suppurative infection of the skin, including infection of the wound or burns, with a predilection to produce cellulitis and lymphangitis. Streptococcal subcutaneous infection ranges from cellulitis to Necrotising fasciitis. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 215