This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Bacteria implicated in dental caries 
Select and explain. 
A. Streptococcus mutans, B. Pneumococci, C. Streptococcus pyogenes, D. Staphylococcus aureus
A: Streptococcus mutans
Answer: A: Streptococcus mutans 
Explanation: Ans. is 'a' i.e., streptococcus mutans Viridans streptococci is implicated in causing Dental caries.Various species of viridans streptococci are -S. Salivarius S. Mitis S. Sanguis S. MutansThese bacterias are a part of normal flora of the mouth.They can cause bacteremias through minor trauma such as eating, brushing md flossing, these bacteremias can then cause endocarditis.