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
[{'content': 'A patient present with frontal abscess. Foul smelling pus is aspirated. Pus shows red fluorescence on ultraviolet examination.The most likely organism causing the frontal abscess is - \nSelect and explain. \nA. Bacteroides, B. Peptostreptococcus, C. Pseudomonas, D. Acanthamoeba', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]