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: Medicine
Organism which causes bacterial endocarditis: 
Select and explain. 
A. Lacto bacillus, B. Streptococcus sanguis, C. Streptococcus viridans, D. Streptococcus pyogenes
C: Streptococcus viridans
Answer: C: Streptococcus viridans 
Explanation: None