Which is false regarding Gram positive cocci ?
Unlike streptococci enterococci are not reliably killed by penicillin or ampicillin alone at concentration acheived clinically in the blood or tissues.

Antimicrobial susceptibility testing should be performed routinely on enterococcal isolates.

Other options
Option ‘a’ • Staph. saprophyiticus specially causes UTI in sexually active young women.
Option ‘b’ • Micrococci are catalase and oxidase positive Gr (+ve) cocci. They are strict aerobes and are non pathogenic.

Micrococci are differentiated from Staphylococci by Hugh and deifson oxidation fermentation test in which micrococci shows oxidative pattern while staphylococci show fermentive pattern.
Staph. saprophyticus causes UTI in females
Micrococci are oxidase positive
Most enterococci are sensitive to penicillin
Pneumococci are capsulated