[b]A 32-year-old comes to the physician because of painless growths around her anal region that she first noticed 4 months ago. Over the past 10 years, she has had sexual intercourse with multiple partners. She has a 4-year history of Crohn's disease. Medications include sulfasalazine and metronidazole. Her father has psoriasis. A photograph of the lesions is shown. Examination shows no other abnormalities. Which of the following is the greatest risk factor for this condition? [/b]

A) Crohn's disease
B) Family history of psoriasis
C) Multiple sexual partners
D) Treatment with metronidazole
E) Treatment with sulfasalazine