28 year old sexually active male with burningmicturition. On clinical examination no ulcer in the genitals. Urine examination shows 50 WBCs/HPF, no RBC's, leucocyte esterase positive, gonococcal culture negative. What could be the most probable causative organism '?
Treponema pallidum Neisseria Chlamydia trachomatis H. ducreyi