250.25—Answers.
In any proceeding instituted by the Commission, the Commission may direct that any party respondent shall file an answer to the allegations contained in the order of the Commission initiating such proceeding, or in any statement of facts filed in such proceeding. Unless otherwise directed by the Commission, such answer shall conform to the requirements for answers to pleadings specified in the Federal Rules of Civil Procedure. The Commission recognizes the right of any person directed to file any such answer to set forth therein appropriate reservations of constitutional or other legal rights.