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': 'Which of the following have the capability to produce extra cellular polysaccharides \nSelect and explain. \nA. Strep. mutans, B. Strep. pyogenes, C. Peptostreptococcus, D. Enterococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]