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
Most common gram positive cocci responsible for URI in sexually active females. 
Select and explain. 
A. S.epidermidis, B. S.hycius, C. S.intermedius, D. E.coli
A: S.epidermidis
Answer: A: S.epidermidis 
Explanation: Most common is E.coli
Most common GPC is S.epidermidis