You are answering a USMLE-style medical question. Question: A 15-year-old girl comes to the physician because of a 2-week history of genital lesions. She has no history of serious illness. She is sexually active with 2 male partners and uses condoms inconsistently. Vital signs are within normal limits. Pelvic examination shows multiple hyperkeratotic exophytic papules over the vulva. The lesions turn white on application of 3% acetic acid. Which of the following is most likely to have prevented this patient's condition? Options: A) Condoms B) Anti-HIV prophylaxis C) Spermicidal foam D) Vaccination Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.