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
CHX is not effective against: 
Select and explain. 
A. Ent.faecalis., B. Streptococcus mitis., C. Candida Albicans, D. None.
B: Streptococcus mitis.
Answer: B: Streptococcus mitis. 
Explanation: CHX has been shown to be effective against both Ent.faecalis and Candida albicans in vitro studies.