You are answering a USMLE-style medical question. Question: A prominent male politician has secret homosexual desires. However, rather than engaging in homosexual behavior, he holds rallies against gay rights and regularly criticizes gay people. The politician is displaying which of the following defense mechanisms? Options: A) Repression B) Reaction formation C) Denial D) Displacement Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.