<prompt> Which one of the following gram positive organism is most common cause of UTI among sexually active women?Staphylococcus epidermidisStaphylococcus aureusStaphylococcus saprophyticusEnterococcus  <response>: Ans. is c i.e., Staphylococcus saprophyticusRef: Ananthanarayan, 9the, p. 206 and 8the, p. 202Staph saprophyticus may be present on normal human skin and the periurethral area and can cause urinary tract infection, particularly in sexually active young women.Note: Most common cause is E. coli, which is not provided in the option. 