<prompt> Which one of the following Gram positive organism is most common cause of UTI among sexually active women :Staphylococcus epidermidisStaphylococcus aureusStaphylococcus saprophyticusEnterococcus  <response>: Remember:MC cause of UTI - E. coliMC cause of nosocomial UTI - E. coliMC nosocomial infection - UTIS. saprophyticus produce UTI characteristically in sexually active young womanEnterococci and S.aureus cause infections in patients with renal stones or previous instrumentation or surgery. 