(1) The respondent shall answer the complaint in writing and shall specifically admit, deny, or explain each of the facts alleged in the complaint, unless the respondent is without knowledge or information sufficient to form a belief, in which case the respondent shall so state, and such statement shall operate as a denial.
(2) Any allegation in the complaint not specifically denied or explained shall be deemed admitted and shall be so found by the Commission unless good cause to the contrary is shown.
(3) The respondent shall have the power reasonably and fairly to amend its answer.