MSFinals-1612

A 30-year-old woman visits her General Practitioner with a complaint of a thick, cottage-cheese like vaginal discharge that has a yellowish hue. The patient reports that the discharge began two days ago. She denies any presence of blood in the discharge, but does experience pain while urinating. Upon physical examination, the patient does not exhibit any pain and there are no palpable masses.
What is the probable diagnosis?