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
Commonly isolated organism from oral cavity is 
Select and explain. 
A. Streptococcus sanguis, B. Streptococcus pyogens, C. Neisseria gonorrheoa, D. Streptococcus pneumonia
A: Streptococcus sanguis
Answer: A: Streptococcus sanguis 
Explanation: None