29 C.F.R. § 1921.4 – Answer.

(a) Filing and service. Within 14 days after the service of the complaint, the respondent shall file an answer with the Chief Hearing Examiner. The answer shall be signed by the respondent or his attorney.
(b) Contents; failure to file. The answer shall:
1. (1) Contain a statement of the facts which constitute the grounds of defense, and shall specifically admit, explain, or deny, each of the allegations of the complaint unless the respondent is without knowledge, in which case the answer shall so state; or
2. (2) State that the respondent admits all of the allegations of the complaint. The answer may contain a waiver of hearing.
  Failure to file an answer to or plead specifically to any allegation of the complaint shall constitute an admission of such allegation.
(c) Procedure upon admission of facts. The admission, in the answer or by failure to file an answer, of all the material allegations of fact contained in the complaint shall constitute a waiver of hearing. Upon such admission of facts, the hearing examiner without further hearing shall prepare his decision in which he shall adopt as his proposed findings of fact the material facts alleged in the complaint. The parties shall be given an opportunity to file exceptions to his decision, and to file briefs in support of the exceptions.