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
[{'content': 'Cellulitis is caused by \nSelect and explain. \nA. Beta hemolytic streptococci, B. Alpha hemolytic streptococci, C. Staphylococcus, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]