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
In deep older plaque 
Select and explain. 
A. Streptococci and actinomyces are replaced by rod like organism, B. Streptococci are completely replaced by neisseria, C. Streptococci actinomyces and veilonella remain prominent, D. Actinomyces are completely replaced by streptococci
A: Streptococci and actinomyces are replaced by rod like organism
Answer: A: Streptococci and actinomyces are replaced by rod like organism 
Explanation: None