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
The organism least likely to be found in normal gingival
crevices is 
Select and explain. 
A. Fusobacterim sp., B. Actionomyces sp., C. Diphtheroids, D. Streptococci sps.
C: Diphtheroids
Answer: C: Diphtheroids 
Explanation: None