What organisms commonly cause orchitis in young adults?

The correct choice highlights that Chlamydia and Gonorrhea are common causes of orchitis, especially in young adults. Orchitis, which is the inflammation of one or both testicles, can occur as a complication of sexually transmitted infections (STIs).

Chlamydia trachomatis and Neisseria gonorrhoeae are the primary STIs associated with this condition in the young adult population due to the sexual transmission route. The inflammation caused by these organisms can lead to acute symptoms, and if untreated, can result in fertility issues. As such, prompt diagnosis and treatment are crucial in individuals presenting with symptoms indicative of orchitis.

Mumps virus is another potential cause of orchitis; however, it is more commonly associated with cases in prepubescent boys or in men who have not been vaccinated against mumps. While it can lead to orchitis, it's less prevalent in the young adult demographic compared to the sexually transmitted infections represented by Chlamydia and Gonorrhea.

E. coli and Pseudomonas are typically associated with urinary tract infections and can lead to epididymitis, particularly in older males or those with urinary tract abnormalities, but they are not the primary organisms responsible for orchitis in the young adult