This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
All are medically impoant streptococci except 
Select and explain. 
A. Streptococcus pyogenes, B. Streptococcus agalactiae, C. Streptococcus equisimilus, D. Streptococcus salivarius
D: Streptococcus salivarius
Answer: D: Streptococcus salivarius 
Explanation: Streptococcus viridans is a miscellany of streptococci, normally resident in the mouth and upper respiratory tract. Based on sugar fermentation, cell wall composition and production of dextrans and levans, they have been classified into: S. mitis S. mutans S. salivarius S. sanguis Reference: Textbook of Microbiology; Anathanarayan and paniker&;s; 9th edition; Page no: 218