28 year old sexually male with burning micturition.On clinically examination no ulcer in the genitals.Urine examination shows 50 WBCs/HPF, no RBC's, leucocyte esterase positive, gonococcal culture negative.What would be the most probable causative organism ?

• A. Neisseria
• B. Treponema pallidum
• C. H. ducreyi
• D. Chlamydia trachomatis