This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra and penis, Subject name: Surgery
[{'content': 'Commonest organism giving rise to urinary tract infection: \nSelect and explain. \nA. E. coli, B. Proteus, C. Staphylococcus, D. Streptococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Most common hospital acquired infection- UTI- Most common organism responsible for UTI- E. coli', 'role': 'assistant'}]