Which STD is known for causing painful urination and discharge?

Gonorrhea is known for causing painful urination and discharge. It is a sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae. The symptoms in men often include a painful burning sensation during urination and a purulent discharge from the urethra. In women, while symptoms may be less pronounced, they can still experience dysuria and abnormal vaginal discharge. Understanding these symptoms is crucial for early diagnosis and treatment, which can help prevent complications.

Other options, while related to sexually transmitted infections and presenting various symptoms, do not specifically align with this particular symptom of painful urination and discharge. For instance, HIV primarily affects the immune system and may not cause these specific symptoms early in infection. Syphilis can present with genital sores but does not typically cause the classic painful urination and discharge associated with gonorrhea. Trichomoniasis can lead to symptoms such as vaginal discharge and irritation but doesn't usually cause pain during urination in the way that gonorrhea does. Thus, gonorrhea is the most pertinent answer to this question based on the symptomatology described.