This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
[{'content': 'A 33-year-old female patient presented with brain abscess. On aspiration it was foul smelling and gave red fluorescence on UV light, likely diagnosis is \nSelect and explain. \nA. Acanthameba, B. Peptostreptococci, C. Bacteroids, D. Staphylococcus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) Bacteroids # B. fragilis is the most frequent of the nonsporing anaerobes isolated from clinical specimens. It is often recovered from blood, pleural and peritoneal fluids, CSF, brain abscesses, wounds and urogenital infections.', 'role': 'assistant'}]