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: Microbiology
True about streptococcus - 
Select and explain. 
A. Lancefield classification is based on M protein, B. Group `G' not found in human, C. Group 'B' causes neonatal meningitis, D. Group 'C' can be isolated from vaginal flora
C: Group 'B' causes neonatal meningitis
Answer: C: Group 'B' causes neonatal meningitis 
Explanation: Ans. is `c i.e. Group 'B' causes neonatal meningitis Lancefield classification is based on carbohydrate 'C' antigen not on M protein. Besides Str. pyogenes, streptococci belonging to group B, C, D, F, G and rarely H, K, 0 and R may also cause human infections. Group B streptococcus is the single most common cause of neonatal meningitis. Group C streptococci are pa of normal flora of throat (not of vaginal flora) Group D streptococci ie enterococci can cause urinary tract infection.