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: Dental
ANUG is caused by 
Select and explain. 
A. Borrelia vincenti and fusobacterium, B. Actinomycetam comitans, C. Actinomyces nausetadii, D. Streptococcus mutans
A: Borrelia vincenti and fusobacterium
Answer: A: Borrelia vincenti and fusobacterium 
Explanation: None