You are answering a USMLE-style medical question. Question: A 74-year-old man has been treated for prostate cancer for the past 6 months. He is on an experimental drug (drug X) that is used to reduce the action of testosterone by blocking the androgen receptor. Since the initiation of therapy, the growth of the cancerous tissue has slowed. This medication is known to be excreted by the kidneys at the current dose that he is taking. The patient has no significant complaints, except for excessive sweating at times. On physical examination, a small area of tissue around his nipples is enlarged bilaterally. No other abnormal findings are present. Which of the following drugs most likely belongs to be the same class as drug X? Options: A) Leuprolide B) Finasteride C) Flutamide D) Anastrozole Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.