The dysuria, dyspareunia, and a mucopurulent vaginal discharge.

A 24-year-old woman presents to the clinic with dysuria, dyspareunia, and a mucopurulent vaginal discharge. Her boyfriend was recently treated for nongonococcal urethritis. What sexually transmitted disease (STD) has she most probably been exposed to?

a. Gonorrhea
b. Human papillomavirus (HPV)
c. Chlamydia
d. Trichomonas