89 Ill. Adm. Code 270.426
Answer
Section 270.426 Answer
When an answer is necessary or allowed, the following apply:
a) The
party shall timely file an answer. The answer shall be in writing, signed by
the party or representative, and shall contain a specific response to each
allegation in the initial pleading. The response shall admit the allegation,
deny it, or state that the party has insufficient information to admit or deny the
allegation.
b) When
a party has responded that it has insufficient information to admit or deny the
allegation, that response will serve as a denial.
c) A
failure to timely file a necessary answer will be deemed an admission of all
allegations and may form the basis of a decision against the party that failed
to answer.