question: Q:A 27-year-old woman comes to the physician for a 1-week-history of painful urination and urinary frequency. She has no history of serious illness and takes no medications. She is sexually active with her boyfriend. Her temperature is 36.7°C (98.1°F). There is no costovertebral angle tenderness. Urine dipstick shows leukocyte esterase. A Gram stain does not show any organisms. Which of the following is the most likely causal pathogen?? 
  {'A': 'Neisseria gonorrhoeae', 'B': 'Escherichia coli', 'C': 'Gardnerella vaginalis', 'D': 'Chlamydia trachomatis', 'E': 'Trichomonas vaginalis'},