Janet is a 23 year old female who presents with dysuria. The…

Janet is a 23 year old female who presents with dysuria. The urinalysis shows nitrites and leukocytes. She is negative for GC/Chlamydia, and negative pregnancy test. She has no known allergies. You consider her to have an uncomplicated UTI.  In treating her UTI which of the following is the most appropriate to prescribe for an uncomplicated urinary tract infection?