<prompt> True about streptococcus -Lancefield classification is based on M proteinGroup G not found in humanGroup B causes neonatal meningitisGroup C can be isolated from vaginal flora  <response>: 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. 