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: Medicine
[{'content': 'Urinary tract infection by a gram +ve organism in a young sexually active female is due to - \nSelect and explain. \nA. B. Subtilis, B. E. coli, C. Staph. Saprophyticus, D. Strept. pyogenos', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]