A man presents to a ST clinic with urethritis and urethral discharge. Gram stain shows numerous pus cells but no microorganism. The culture is negative on the routine laboratory media. The most likely agent is -: (A) Chlamydia trachomatis, (B) Haemophilus ducreyi, (C) Treponema pallidum, (D) Neisseria gonorrhoeae
Answer is A. None