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: Pathology
S. mutans is involved in dental caries initiation. Other bacteria also involved is: 
Select and explain. 
A. S. sarcinus, B. S. macae, C. S. sanguis, D. S. salivarius
C: S. sanguis
Answer: C: S. sanguis 
Explanation: None