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': 'Most common gram positive cocci responsible for URI in sexually active females. \nSelect and explain. \nA. S.epidermidis, B. S.hycius, C. S.intermedius, D. E.coli', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common is E.coli\nMost common GPC is S.epidermidis', 'role': 'assistant'}]