This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
A patient presents with a frontal abscess. Foul-smelling pus is aspirated. Pus shows red fluorescence on the ultraviolet examination. The most likely organism causing the frontal abscess is 
Select and explain. 
A. Prevotella, B. Peptostreptococcus, C. Pseudomonas, D. Acanthamoeba
A: Prevotella
Answer: A: Prevotella 
Explanation: The causative organism is likely to be Prevotella melaninogenica. It is easy to recognize because of the black or brown color of colonies. Culture or specimen under ultraviolet light may show a bright red fluorescence. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 275