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
[{'content': 'A boy with skin ulcer on leg, culture reveals beta hemolysis. Cultures from school children with sore throat some days back also revealed beta hemolysis. What is the similarity between both- \nSelect and explain. \nA. Mec A gene is related to it, B. M protein is same, C. C carbohydrate antigen is same, D. Strains causing both are same', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]