17 C.F.R. § 8.13 Answer to charges.
Title 17 - Commodity and Securities Exchanges
The respondent shall be given a reasonable period of time to file an answer to the charges. The rules of an exchange may provide that: (a) The answer must be in writing and include a statement that the respondent admits, denies or does not have and is unable to obtain sufficient information to admit or deny each allegation. A statement of a lack of sufficient information shall have the effect of a denial of an allegation. (b) Failure to file an answer on a timely basis shall be deemed an admission of all allegations contained in the notice of charges. (c) Failure in an answer to deny expressly a charge shall be deemed to be an admission of such charge.
Title 17: Commodity and Securities Exchanges
PART 8—EXCHANGE PROCEDURES FOR DISCIPLINARY, SUMMARY, AND MEMBERSHIP DENIAL ACTIONS
Subpart B—Disciplinary Procedure
§ 8.13 Answer to charges.

