45 CFR §1149.17

1. (a)You may respond to the complaint by filing an answer with the reviewing official within 30 days of service of the complaint. A timely answer will be considered a request for an oral hearing.
2. (b)In the answer, you—
   1. (1)Must admit or deny each of the allegations of liability contained in the complaint (a failure to deny an allegation is considered an admission);
   2. (2)Must state any defense on which you intend to rely;
   3. (3)May state any reasons why you believe the penalties, assessments, or both should be less than the statutory maximum; and
   4. (4)Must state the name, address, and telephone number of the person authorized by you to act as your representative, if any.