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: Unknown
[{'content': 'Acute bacterial prostatitis is caused by: \nSelect and explain. \nA. E. Coli, B. Streptococcus viridans, C. Staphylococcus aureus, D. Proteus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Textbook of Microbiology and Immunology BY Parija. Page. 182, 261\n\xa0\nBacterial prostatitis is usually caused by E. coli or another gram-negative rod, with one of two presentations.\n\nAcute bacterial prostatitis presents with fever and chills; prostate examination should be gentle or not performed at all, as massage may result in a wave of bacteremia.\nChronic bacterial prostatitis presents as recurrent episodes of bacterial cystitis', 'role': 'assistant'}]