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
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 - 
Select and explain. 
A. Bacteroides, B. Peptostreptococcus, C. Pseudomonas, D. Acanthamoeba
A: Bacteroides
Answer: A: Bacteroides 
Explanation: None