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
Causative organism for ANIIG is: 
Select and explain. 
A. Fusospirochetal bacilli, B. Treponema pallidum and spirochetes, C. Streptococcus sanguis, D. Sptreptococcus epidermidis
A: Fusospirochetal bacilli
Answer: A: Fusospirochetal bacilli 
Explanation: None