A. Neisseria gonorrhoeae
Explanation:
NGU stands for Non-Gonococcal Urethritis which is an infection caused by pathogens other than gonorrhea in the urethra. There are several bacteria which are known to be the causative agent of this disease such as - Chlamydia, Mycoplasma, Trichomonas, etc.Out of the various bacteria, Chlamydia is the most common causative agent of NGU. The disease can be transmitted sexually, non sexually or perinatally.Â